Disease Management
Learn more about strategies for managing many different diseases that affect sweetpotatoes!
Unlike management strategies for weed management and root-knot nematode management, overarching disease management in sweetpotato is not straightforward. General disease management is difficult given that common sweetpotato diseases are caused by many diverse pathogens, ranging from bacteria to fungi to viruses! With this diversity, management strategies vary greatly. However, there are general guidelines for disease management in sweetpotato that can reduce disease incidence and additional measures can be added to target specific disease pathogens. Below you can learn more about guidelines for general disease management in sweetpotato.
Guidelines for General Disease Management
- Select a field without prior history of sweetpotato disease.
- Utilize disease-free planting material for transplanting.
- Ensure that planting material was maintained and collected while following proper practices to minimize disease exposure.
- Select a field without a large weed population that may serve as a pathogen reservoir.
- Transplant sweetpotato planting material when environmental conditions are not optimal for disease incidence.
- Clean equipment that comes into contact with soils and planting material that may serve as a pathogen reservoir.
- For commercial growers, applications of different pesticides such as fungicides can reduce disease incidence.
- Ensure that curing, storage, and packing facilities are properly maintained, including adhering to strict cleaning and sanitation protocols.
For more specific recommendations for the management of sweetpotato diseases, you can view various NCSU Extension Sweetpotato Disease Factsheets and LSU AgCenter Sweet Potato Disease Factsheets. For specific pesticide application recommendations for each state associated with the SweetARMOR project, look below.
North Carolina
Tables 1-3. The below tables have been adapted from the 2022 North Carolina Agricultural Chemicals Manual.
Traditional Disease Control: Pesticide Use
| Disease | Material | FRAC Code | Rate of Material Formulation | Minimum Days | Method, Schedule, and Remarks | |
|---|---|---|---|---|---|---|
| Harv. | Reentry | |||||
| Black Rot (Ceratocystis fimbriata), Scurf (Monilochaetes infuscans), and Foot Rot (Plenodomus destruens) | thiabendazole (Mertect 340 F) | 3 | 107 fl oz/100 gal | 0.5 | 0.5 | Dip seed roots 1 to 2 minutes and plant immediately. |
| Postharvest Black Rot (Ceratocystis fimbriata) | thiabendazole (Mertect 340 F) | 3 | 0.42 fl oz per 2,000 lb of roots or 0.42 fl oz/gal | 0.5 | 0.5 | SECTION 18 LABEL ONLY IN NORTH CAROLINA. Post-harvest treatment of sweetpotato for control of black rot. Limit to one application during packing. Mist washed roots on a conveyor line, with tumbling action, before packing with 0.42 fl oz of Mertect to each 2,000 lb of roots in sufficient water for complete coverage. Alternatively, dip the roots for 20 seconds in 0.42 fl oz of Mertect per gal of water. Ensure roots are dry before packing. |
| Circular Spot (Sclerotium rolfsii), Sclerotial Blight (Sclerotium rolfsii), Rhizoctonia Stem Canker (Rhizoctonia solani), Pythium Root Rot (Pythium) | azoxystrobin (Quadris) 2.08 F | 11 | 0.4 to 0.8 fl oz/1,000 row feet | — | 4 hr | Make in-furrow or banded applications shortly after transplanting. |
| dichloran (Botran) 5F | 0.6 qt/7.5 gal (Seed Dip) 5.73 oz in 14 gal/1000 linear feet of plant bed (Plant bed spray) | — | 0.5 | Labeled for Southern blight (Sclerotium rolfsii). Seed dip: Dip seed sweetpotatoes 10 to 15 seconds in a well-agitated fungicide suspension. Drain sweet- potatoes and bed promptly. Prepare fresh fungicide suspension daily. Plant bed spray: Spray or sprinkle over bedded sweetpota-toes before covering them with soil. Note: Not for use in Virginia, Tennessee, or South Carolina. |
||
| fluazinam (Omega) 500F | 29 | 5.5 to 8 fl oz/acre | 14 | 0.5 | Labeled for control of white mold (Sclerotinia). Begin applications when plants are 6 to 8 inches tall. Repeat applications at intervals of 7 to 10 days. See label for rate. Do not apply more than 3.5 pints per acre per year. | |
| Seed-borne and soilborne fungi that cause decay, damping off or seedling blight | azoxystrobin (Dynasty) 0.83 F | 11 | 0.19 to 0.38 fl oz per 100 lb of propagating roots | — | 4 hr | Apply uniformly to seed roots as a water-based slurry. |
| fludioxonil (Maxim 4 FS) | 12 | 0.08 to 0.16 fl oz/100 lb of propagating roots | — | 0.5 | Apply uniformly to seed roots as a water-based slurry. | |
| Damping Off (Pythium spp.) | Bacillus amyloliquefaciens (Serifel) | 44 | 4 to 16 oz/acre | 0 | 4 hr | See label Soil Application Instructionsfor In-furrow, Drench, Shanked-Inand Injected Applications. |
| cyazofamid (Ranman 400SC) | 21 | 6/1 fl oz/acre | 7 | 0.5 | Apply at planting. Refer to label for details. | |
| ethaboxam (Elumin) | 22 | 8 fl oz/acre | _ | 0.5 | Apply in-furrow or as a side dressing over seed piece. Do not make more than two applications per year or apply more than 16 fl oz per acre per year. | |
| fluopicolide (Presidio) | 43 | 3 to 4 fl oz/acre | 7 | 0.5 | Must be tank mixed with a labeled rate of another fungicide active against the target pathogen, but with a different moved of action. Repeat applications at 10-day intervals. | |
| mefenoxam (Ridomil Gold) 4 SL | 4 | 1 to 2 pt/treated acre | _ | 2 | Incorporate in soil. See label for row rate. | |
| metalaxyl (MetaStar) 2 E | 4 | 4 to 8 pt/treated acre | 7 | 2 | Preplant incorporated or soil surface spray. | |
| Foliar Diseases (Alternaria) | azoxystrobin (Aframe, generic) | 11 | 6 to 15.5 fl oz/acre | 0 | 4 hr | Limit to 123 fl oz per acre per season. For soilborne disease control, refer to label. Begin foliar applications prior to disease and continue on a 5- to 7-day interval. |
| cyprodinil + fludioxonil (Switch 62.5WG) | 9 + 12 | 11 to 14 oz/acre | 7 | 0.5 | Begin foliar applications prior to disease and continue on a 7- to 10-day interval. | |
| difenoconazole + benzovin-diflupyr (Aprovia Top) | 7 + 3 | 10.5 to 13.5 fl oz/acre | 14 | 0.5 | No more than two applications can be made at a 7-day interval; all other applications must be made at a 14-day interval. Apply no more than 27 fl oz per acre per year. | |
| fenamidone (Reason 500SC) | 11 | 5.5 to 8.2 fl oz/acre | 14 | 0.5 | Begin foliar applications prior to disease and continue on a 5- to 10- day interval. | |
| fluoxastrobin (Aftershock) | 11 | 2 to 3.8 fl oz/acre | 7 | 0.5 | Limit to 22.8 fl oz per acre per year. For soilborne disease control, refer to label. Begin foliar applications prior to disease and continue on a 7- to 10-day interval. | |
| pydiflumetofen + fludioxonil (Miravis Prime) | 7 + 12 | 6.8 fl oz/acre | 7 | 0.5 | Limit to 20.4 fl oz/acre per year. Begin applications prior to disease development. Continue applications through season on a 7- to 10-day interval. | |
| pyraclostrobin (Cabrio) 20 WG | 11 | 8 to 12 oz/acre | 0 | 0.5 | Do not apply more than 48 fl oz per acre per season. Alternate with a fungicide with a different mode of action after each use. | |
| pyrimethanil (Scala SC) | 9 | 7 fl oz/acre | 7 | 0.5 | Begin foliar applications prior to disease and continue on a 7- to 14- day interval. | |
| trifloxystrobin (Flint Extra) | 11 | 3 to 3.8 oz/acre | 7 | 0.5 | Apply on a 7 to 10 day interval as needed. Do not make more than six applications per year or apply more than 23 fl oz per acre per year. | |
| Postharvest Fusarium Rot (Fusarium) | azoxystrobin + fludioxonil + difenoconazole (Stadium) | 11 + 12+ 3 | 1 fl oz per 2,000 lbs of roots | _ | _ | Ensure proper coverage, use tumbling, and mix the fungicide solution in sufficient water volume. Do not make more than one postharvest application. |
| Mottle Necrosis (Pythium Postharvest) | potassium phosphite (Allude) | P07 | 1¼ quarts/acre | 0 | 4 hr | Foliar spray at 5- to 14-day intervals depending on disease incidence. |
| Powdery Mildew | azoxystrobin+ difeno-conazole (Quadris Top) | 11 + 3 | 8 to 14 fl oz/acre | 14 | 0.5 | Begin foliar applications prior to disease and continue on a 7- to 14-day interval. |
| cyprodinil + fludioxonil (Switch 62.5WG) | 9 + 12 | 11 to 14 oz/acre | 7 | 0.5 | Begin foliar applications prior to disease and continue on a 7- to 10-day interval. | |
| difenoconazole + benzovindiflupyr (Aprovia Top) | 7 + 3 | 10.5 to 13.5 fl oz/acre | 14 | 0.5 | No more than two applications can be made at a 7-day interval; all other applications must be made at a 14-day interval. Apply no more than 27 fl oz per acre per year. | |
| fluopyram + pyrimethanil (Luna Tranquility) | 7 + 9 | 11.2 fl oz/acre | 7 | 0.5 | Limit to 54.7 fl oz per acre per year. Do not make more than two sequential applications of Group 7-containing fungicides. Labeled for Alternaria and Sclerotinia. Apply at 7- or 14-day intervals. | |
| metconazole (Quash) | 3 | 2.5 to 4 oz/acre | 1 | 0.5 | Begin foliar applications prior to disease and continue on a 7- to 10-day interval. Do not apply more than 16 fl oz per year or four times per year. Do not make more than two sequential applications before alternating with products with different modes of action. | |
| penthiopyrad (Vertisan) | 7 | 0.7 to 24 fl oz/acre | 7 | 0.5 | For soilborne disease control, refer to label. Begin foliar applications prior to disease and continue on a 7- to 14-day interval. | |
| pyraclostrobin (Cabrio) 20 WG | 11 | 8 to 12 oz/acre | 0 | 0.5 | Do not apply more than 48 fl oz per acre per season. Alternate with a fungicide with a different mode of action after each use. | |
| Postharvest Rhizopus Soft Rot (Rhizopus) | dicloran (Botran) 75 W | 14 | 1 lb/100 gal | — | — | Spray or dip. Dip for 5 to 10 seconds in well-agitated suspension. Add ½-pound Botran to 100 gallons of treating suspension after 500 bushels treated. Do not rinse. |
| fludioxonil (Scholar 1.9 SC) | 12 | 16 to 32 fl oz/100 gal | — | — | Dip for approximately 30 seconds in well-agitated solution and allow sweetpotatoes to drain. Add 8 fl oz to 100 gals after 500 bushels are treated. ALTERNATIVELY, mix 16 fluid ounces in 7 to 25 gallons of water, wax/emulsion, or aqueous dilution of wax/oil emulsion. Can also be used to disinfest tanks, refer to label. | |
| White Mold (Sclerotinia) | Bacillus amyloliquefaciens (Serifel) | 44 | 4 to 16 oz/acre | 0 | 4 hr | Begin foliar applications shortly after emergence or transplanting and continue on 7- to 10-day intervals. |
| boscalid (Endura) | 7 | 5.5 to 10 oz/acre | 10 | 0.5 | Begin applications prior to disease development and apply again at a 7 to 14 day interval. Do not apply more than 20 fl oz per year. Do not make more than two sequential applications before alternating with products with different modes of action. | |
| Coniothyrium minitans (Contans WG) | — | 1 to 4 lb/acre | 0 | 4 hr | OMRI listed product. Apply to soil surface and incorporate no deeper than 2 inches. Works best when applied prior to planting or transplanting. Do not apply other fungicides for 3 weeks after applying Contans. | |
| fluazinam (Omega 500F, Lektivar 40SC) | 29 | 5.5 to 8 fl oz/acre | 14 | 0.5 | Initiate applications when conditions are favorable for disease development or when disease symptoms first appear. Repeat applications on a 7 to 10 day schedule. Do not apply more than 3.5 pints per year. | |
| metconazole (Quash) | 3 | 4 oz/acre | 1 | 0.5 | Make an application prior to disease development and apply again 14 days later. Do not apply more than 16 fl oz per year or four times per year. Do not make more than two sequential applications before alternating with products with different modes of action. | |
| Pydiflumetofen + difenoconazole (Miravis Top) | 3 + 7 | 13.7 fl oz/acre | 14 | 0.5 | Apply in sufficient volume of water to ensure good coverage. Do not make more than two applications of Miravis Top or other Group 3 and 7 fungicides before alternation with a fungicide that is not in Group 3 or 7. Do not make more than 4 applications at the maximum application rate per year. | |
| Scurf (Monilochaetes infuscans) and Sclerotial Blight (Sclerotium rolfsii) | dicloran (Botran) 75 W | 14 | 1 lb/100 gal | — | — | Seed dip: Dip seed sweetpotatoes 10 to 15 seconds in a well-agitated fungicide suspension. Drain sweet-potatoes and bed promptly. Prepare fresh fungicide suspension daily. Plant bed spray: Spray or sprinkle over bedded sweet-potatoes before covering them with soil. |
| thiabendazole (Mertect 340 F) | 3 | 107 fl oz/100 gal | 0.5 | 0.5 | Dip seed roots 1 to 2 minutes and plant immediately. | |
| Southern Blight (Sclerotium rolfsii) | dicloran (Botran) 75 W | 14 | 1 lb/100 gal | — | — | Seed dip: Dip seed sweetpotatoes 10 to 15 seconds in a well-agitated fungicide suspension. Drain sweet-potatoes and bed promptly. Prepare fresh fungicide suspension daily. Plant bed spray: Spray or sprinkle over bedded sweet-potatoes before covering them with soil. |
| difenoconazole + benzovin-diflupyr (Aprovia Top) | 7 + 3 | 10.5 to 13.5 fl oz/acre | 14 | 0.5 | No more than two applications can be made at a 7-day interval; all other applications must be made at a 14-day interval. Apply no more than 27 fl oz per acre per year. | |
| White Rust (Albugo ipomoea-panduratae) | azoxystrobin (Quadris) 2.08 F | 11 | 6.2 to 15.4 fl oz/acre | 7 | 4 hr | Make no more than two sequential applications before alternating with fungicides that have a different mode of action. Apply no more than 2.88 quarts per crop per acre per season. |
| fenamidone (Reason 500SC) | 11 | 5.5 to 8.2 fl oz/acre | 14 | 0.5 | Begin applications when conditions favor disease development, and continue on 5 to 10 day interval. Do not apply more than 16.4 fluid ounces per growing season. Alternate with a fungicide from different resistance management group. | |
| pyraclostrobin (Cabrio) 20 WG | 11 | 8 to 16 oz/acre | 0 | 0.5 | Do not apply more than 48 ounces per acre per season. Alternate with a fungicide with a different mode of action after each use. | |
Efficacy of Products for Disease Control
Table Scale: E = excellent; G = good; F = fair; P = poor; NC = no control; ND = no data
| Active Ingredient | Product | Fungicide Group | Nematicide (N) or Fungicide (F) | Alternaria leaf spot | Black rot (C. fimbriata) | Fusarium | Java black rot (D. gossypina) | Pythium | Rhizopus soft rot (R. stolonifer) | Southern blight (S. rolfsii) | Sclerotinia | Scurf (M. infuscans) | Soil rot/Pox (S. ipomoea) | Sweetpotato Feathery Mottle virus |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| azoxystrobin + fludioxonil + difenoconazole | Stadium | 11+12+3 | F | ND | E | ND | ND | ND | E | ND | ND | ND | ND | NC |
| boscalid | Endura | 7 | F | ND | ND | ND | ND | ND | ND | ND | E | ND | ND | NC |
| chlorine sanitizer postharvest | F | ND | F | ND | P | ND | F | ND | ND | P | NC | NC | ||
| chloropicrin | N, F | ND | P | F | F | ND | ND | F | ND | ND | F | NC | ||
| Coniothyrium minitans | Contans WG | F | ND | ND | ND | ND | ND | ND | ND | F | ND | ND | NC | |
| cyazofamid | Ranman | 21 | F | ND | ND | ND | ND | ND | ND | ND | ND | ND | ND | NC |
| dicloran | Botran 75W | 14 | F | ND | P | ND | P | ND | F | P | G | F | NC | NC |
| 1,3-dichloropropene | Telone II | N | ND | ND | P | ND | ND | ND | ND | ND | ND | ND | NC | |
| difenoconazole + benzovindiflupyr | Aprovia Top | 3+7 | F | ND | ND | ND | ND | ND | E | ND | ND | ND | ND | NC |
| ethaboxam | Elumin | 22 | F | ND | ND | ND | ND | G | ND | ND | ND | ND | ND | NC |
| ethoprop | Mocap | N | ND | ND | ND | ND | ND | ND | ND | ND | ND | ND | NC | |
| fludioxonil | Scholar | 12 | F | ND | F | ND | ND | ND | F | NC | ND | ND | NC | NC |
| fluopicolide | Presidio | 43 | F | ND | ND | ND | ND | G | ND | ND | ND | ND | ND | NC |
| fluopyram | Velum Prime | 7 | N, F | ND | ND | ND | ND | ND | ND | ND | ND | ND | ND | NC |
| mefenoxam | Ridomil Gold | 4 | F | ND | ND | ND | ND | G | ND | ND | ND | ND | ND | NC |
| metconazole | Quash | 3 | F | ND | E | ND | ND | ND | ND | ND | ND | ND | ND | NC |
| metam sodium | Vapam | N | ND | P | F | ND | ND | ND | ND | ND | ND | ND | NC | |
| metalaxyl | MetaStar | 4 | F | ND | ND | ND | ND | F | ND | ND | ND | ND | ND | NC |
| oxamyl | Vydate | N | ND | ND | ND | ND | ND | ND | ND | ND | ND | ND | NC | |
| Pseudomonas syringae | Bio-Save | F | ND | ND | ND | ND | ND | P | ND | ND | ND | ND | NC | |
| thiabendazole | Mertect 340-F | 1 | F | ND | E | P | F | ND | E | F | ND | P | NC | NC |
Alternative Methods for Disease Control
Table Scale: E, excellent; G, good; F, fair; P, poor; NC, no control; ND, no data.
| Strategy | Alternaria leaf spot | Black rot (C. fimbriata) | Fusarium | Java black rot (D. gossypina) | Pythium | Rhizopus soft rot (R. stolonifer) | Sclerotinia | Southern blight | Scurf (M. infuscans) | Soil rot/Pox (S. ipomoea) | Sweetpotato Feathery Mottle virus |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Crop rotation (3 to 4 years) | P | F | F | F | P | NC | F | F | P | F | NC |
| Disease-free planting stock | NC | E | G | G | P | NC | NC | P | E | P | G |
| Resistant cultivars | F | NC | F | F | P | F | F | F | P | G | F |
| Careful handling to reduce mechanical injury | NC | F | F | NC | P | E | F | NC | NC | NC | NC |
| Cutting plants (in beds) above soil line | NC | G | F | F | P | NC | NC | NC | G | P | NC |
| Soil sample for nematode analysis | NC | NC | NC | NC | P | NC | NC | NC | NC | NC | NC |
| Sanitation (equipment, fields, storage houses) | F | E | P | F | P | E | NC | NC | P | NC | NC |
| Manage insects that transmit pathogens | NC | P | NC | NC | P | NC | NC | NC | NC | NC | NC |
| Sulfur added to soil to reduce pH | NC | NC | NC | NC | P | NC | NC | NC | NC | F | NC |
| Prompt curing and proper storage conditions | NC | E | F | F | P | E | NC | NC | NC | NC | NC |
| Site selection (drainage) | P | NC | F | F | E | F | G | P | NC | P | NC |
| Manage insects that cause feeding injuries to roots | NC | G | NC | P | P | P | NC | NC | NC | NC | NC |
| Avoid harvesting when soils are wet | F | G | NC | F | G | F | F | NC | NC | NC | NC |
South Carolina
Tables 4-6. The below tables have been adapted from the 2022 Southeastern US Vegetable Crop Handbook.
Traditional Disease Control: Pesticide Use
| Disease | Material | FRAC Code | Rate of Material Formulation | Minimum Days | Method, Schedule, and Remarks | |
|---|---|---|---|---|---|---|
| Harv. | Reentry | |||||
| Black rot (Ceratocystis fimbriata), scurf (Monilochaetes infuscans), and foot rot (Plenodomus destruens) | thiabendazole (Mertect 340 F) | 3 | 107 fl oz/100 gal | 0.5 | 0.5 | Dip seed roots 1 to 2 minutes and plant immediately. |
| Postharvest black rot (Ceratocystis fimbriata) | thiabendazole (Mertect 340 F) | 3 | 0.42 fl oz per 2,000 lb of roots or 0.42 fl oz/gal | 0.5 | 0.5 | SECTION 18 LABEL ONLY IN NORTH CAROLINA. Postharvest treatment of sweetpotato for control of black rot. Limit to one application during packing. Mist washed roots on a conveyor line, with tumbling action, before packing with 0.42 fl oz of Mertect to each 2,000 lb of roots in sufficient water for complete coverage. Alternatively, dip the roots for 20 seconds in 0.42 fl oz of Mertect per gal of water. Ensure roots are dry before packing. |
| Circular spot (Sclerotium rolfsii), Sclerotial blight (Sclerotium rolfsii), Rhizoctonia stem canker (Rhizoctonia solani), Pythium root rot (Pythium) | azoxystrobin (Quadris) 2.08 F | 11 | 0.4 to 0.8 fl oz/1,000 row feet | — | 4 hr | Make in-furrow or banded applications shortly after transplanting. |
| fluazinam (Omega) 500F | 29 | 5.5 to 8 fl oz/acre | 14 | 0.5 | Labeled for control of white mold (Sclerotinia). Begin applications when plants are 6 to 8 inches tall. Repeat applications at intervals of 7 to 10 days. See label for rate. Do not apply more than 3.5 pints per acre per year. | |
| Seed-borne and soilborne fungi that cause decay, damping off or seedling blight | azoxystrobin (Dynasty) 0.83 F | 11 | 0.19 to 0.38 fl oz per 100 lb of propagating roots | — | 4 hr | Apply uniformly to seed roots as a water-based slurry. |
| fludioxonil (Maxim 4 FS) | 12 | 0.08 to 0.16 fl oz/100 lb of propagating roots | — | 0.5 | Apply uniformly to seed roots as a water-based slurry. | |
| Damping off (Pythium spp.) | cyazofamid (Ranman 400SC) | 21 | 6.1 fl oz/acre | 7 | 0.5 | Apply at planting. Refer to label for details. |
| ethaboxam (Elumin) | 22 | 8 fl oz/acre | _ | 0.5 | Apply in-furrow or as a side dressing over seed piece. Do not make more than two applications per year or apply more than 16 fl oz per acre per year. | |
| fluopicolide (Presidio) | 43 | 3 to 4 fl oz/acre | 7 | 0.5 | Must be tank mixed with a labeled rate of another fungicide active against the target pathogen, but with a different mode of action. Repeat applications at 10-day intervals. | |
| mefenoxam (Ridomil Gold) 4 SL | 4 | 1 to 2 pt/treated acre | _ | 2 | Incorporate in soil. See label for row rate. | |
| metalaxyl (MetaStar) 2 E | 4 | 4 to 8 pt/treated acre | 7 | 2 | Preplant incorporated or soil surface spray. | |
| Foliar diseases (Alternaria) | azoxystrobin (Aframe, generic) | 11 | 6 to 15.5 fl oz/acre | 0 | 4 hr | Limit to 123 fl oz per acre per season. For soilborne disease control, refer to label. Begin foliar applications prior to disease and continue on a 5- to 7-day interval. |
| cyprodinil + fludioxonil (Switch 62.5WG) | 9 + 12 | 11 to 14 oz/acre | 7 | 0.5 | Begin foliar applications prior to disease and continue on a 7- to 10-day interval. | |
| difenoconazole + benzovindiflupyr (Aprovia Top) | 7 + 3 | 10.5 to 13.5 fl oz/acre | 14 | 0.5 | No more than two applications can be made at a 7-day interval; all other applications must be made at a 14-day interval. Apply no more than 27 fl oz per acre per year. | |
| fenamidone (Reason 500SC) | 11 | 5.5 to 8.2 fl oz/acre | 14 | 0.5 | Begin foliar applications prior to disease and continue on a 5- to 10- day interval. | |
| fluoxastrobin (Aftershock) | 11 | 2 to 3.8 fl oz/acre | 7 | 0.5 | Limit to 22.8 fl oz per acre per year. For soilborne disease control, refer to label. Begin foliar applications prior to disease and continue on a 7- to 10-day interval. | |
| pydiflumetofen + fludioxonil (Miravis Prime) | 7+12 | 6.8 fl oz/acre | 7 | 0.5 | Limit to 20.4 fl oz/acre per year. Begin applications prior to disease development. Continue applications through season on a 7- to 10-day interval. | |
| pyraclostrobin (Cabrio) 20 WG | 11 | 8 to 12 oz/acre | 0 | 0.5 | Do not apply more than 48 fl oz per acre per season. Alternate with a fungicide with a different mode of action after each use. | |
| pyrimethanil (Scala SC) | 9 | 7 fl oz/acre | 7 | 0.5 | Begin foliar applications prior to disease and continue on a 7- to 14- day interval. | |
| trifloxystrobin (Flint Extra) | 11 | 3 to 3.8 oz/acre | 7 | 0.5 | Apply on a 7 to 10 day interval as needed. Do not make more than six applications per year or apply more than 23 fl oz per acre per year. | |
| Postharvest Fusarium rot (Fusarium, Albugo ipomoea-panduratae) | azoxystrobin + fludioxonil + difenoconazole (Stadium) | 11 + 12+ 3 | 1 fl oz per 2,000 lbs of roots | _ | _ | Ensure proper coverage, use tumbling, and mix the fungicide solution in sufficient water volume. Do not make more than one postharvest application. |
| Mottle necrosis (Pythium postharvest) | potassium phosphite (Allude) | P07 | 1¼ quarts/acre | 0 | 4 hr | Foliar spray at 5- to 14-day intervals depending on disease incidence. |
| Powdery mildew | azoxystrobin+ difenoconazole (Quadris Top) | 11 + 3 | 8 to 14 fl oz/acre | 14 | 0.5 | Begin foliar applications prior to disease and continue on a 7- to 14-day interval. |
| cyprodinil + fludioxonil (Switch 62.5WG) | 9 + 12 | 11 to 14 oz/acre | 7 | 0.5 | Begin foliar applications prior to disease and continue on a 7- to 10-day interval. | |
| difenoconazole + benzovindiflupyr (Aprovia Top) | 7 + 3 | 10.5 to 13.5 fl oz/acre | 14 | 0.5 | No more than two applications can be made at a 7-day interval; all other applications must be made at a 14-day interval. Apply no more than 27 fl oz per acre per year. | |
| fluopyram + pyrimethanil (Luna Tranquility) | 7 + 9 | 11.2 fl oz/acre | 7 | 0.5 | Limit to 54.7 fl oz per acre per year. Do not make more than two sequential applications of Group 7-containing fungicides. Labeled for Alternaria and Sclerotinia. Apply at 7- or 14-day intervals. | |
| metconazole (Quash) | 3 | 2.5 to 4 oz/acre | 1 | 0.5 | Begin foliar applications prior to disease and continue on a 7- to 10-day interval. Do not apply more than 16 fl oz per year or four times per year. Do not make more than two sequential applications before alternating with products with different modes of action. | |
| penthiopyrad (Vertisan) | 7 | 0.7 to 24 fl oz/acre | 7 | 0.5 | For soilborne disease control, refer to label. Begin foliar applications prior to disease and continue on a 7- to 14-day interval. | |
| pyraclostrobin (Cabrio) 20 WG | 11 | 8 to 12 oz/acre | 0 | 0.5 | Do not apply more than 48 fl oz per acre per season. Alternate with a fungicide with a different mode of action after each use. | |
| pydiflumetofen + fludioxonil (Miravis Prime) | 7+12 | 6.8 fl oz/acre | 7 | 0.5 | Limit to 20.4 fl oz/acre per year. Begin applications prior to disease development. Continue applications through season on a 7- to 10-day interval. | |
| Postharvest Rhizopus soft rot (Rhizopus) | dicloran (Botran) 75 W | 14 | 1 lb/100 gal | — | — | Spray or dip. Dip for 5 to 10 seconds in well-agitated suspension. Add ½-pound Botran to 100 gallons of treating suspension after 500 bushels treated. Do not rinse. |
| fludioxonil (Scholar 1.9 SC) | 12 | 16 to 32 fl oz/100 gal | — | — | Dip for approximately 30 seconds in well-agitated solution and allow sweetpo-tatoes to drain. Add 8 fl oz to 100 gals after 500 bushels are treated. ALTERNA-TIVELY, mix 16 fl oz in 7 to 25 gal of water, wax/emulsion, or aqueous dilution of wax/oil emulsion. Can also be used to disinfest tanks, refer to label. | |
| White mold (Sclerotinia) | Bacillus amyloliquefaciens (Serifel) | 44 | 4 to 16 oz/acre | 0 | 4 hr | Begin foliar applications shortly after emergence or transplanting and continue on 7- to 10-day intervals. |
| boscalid (Endura) | 7 | 5.5 to 10 oz/acre | 10 | 0.5 | Begin applications prior to disease development and apply again at a 7 to 14 day interval. Do not apply more than 20 fl oz per year. Do not make more than two sequential applications before alternating with products with different modes of action. | |
| Coniothyrium minitans (Contans WG) | — | 1 to 4 lb/acre | 0 | 4 hr | OMRI listed product. Apply to soil surface and incorporate no deeper than 2 inches. Works best when applied prior to planting or transplanting. Do not apply other fungicides for 3 weeks after applying Contans. | |
| fluazinam (Omega 500F, Lektivar 40SC) | 29 | 5.5 to 8 fl oz/acre | 14 | 0.5 | Initiate applications when conditions are favorable for disease development or when disease symptoms first appear. Repeat applications on a 7 to 10 day schedule. Do not apply more than 3.5 pints per year. | |
| metconazole (Quash) | 3 | 4 oz/acre | 1 | 0.5 | Make an application prior to disease development and apply again 14 days later. Do not apply more than 16 fl oz per year or four times per year. Do not make more than two sequential applications before alternating with products with different modes of action. | |
| Pydiflumetofen + difenoconazole (Miravis Top) | 3 + 7 | 13.7 fl oz/acre | 14 | 0.5 | Apply in sufficient volume of water to ensure good coverage. Do not make more than two applications of Miravis Top or other Group 3 and 7 fungicides before alternation with a fungicide that is not in Group 3 or 7. Do not make more than 4 applications at the maximum application rate per year. | |
| Scurf (Monilochaetes infuscans) and Sclerotial blight (Sclerotium rolfsii) | dicloran (Botran) 75 W | 14 | 1 lb/100 gal | — | — | Seed dip: Dip seed sweetpotatoes 10 to 15 seconds in a well-agitated fungicide suspension. Drain sweetpotatoes and bed promptly. Prepare fresh fungicide suspension daily. Plant bed spray: Spray or sprinkle over bedded sweetpotatoes before covering them with soil. |
| thiabendazole (Mertect 340 F) | 3 | 107 fl oz/100 gal | 0.5 | 0.5 | Dip seed roots 1 to 2 minutes and plant immediately. | |
| Southern blight (Sclerotium rolfsii) | dicloran (Botran) 75 W | 14 | 1 lb/100 gal | — | — | Seed dip: Dip seed sweetpotatoes 10 to 15 seconds in a well-agitated fungicide suspension. Drain sweetpotatoes and bed promptly. Prepare fresh fungicide suspension daily. Plant bed spray: Spray or sprinkle over bedded sweetpotatoes before covering them with soil. |
| difenoconazole + benzovindiflupyr (Aprovia Top) | 7 + 3 | 10.5 to 13.5 fl oz/acre | 14 | 0.5 | No more than two applications can be made at a 7-day interval; all other applications must be made at a 14-day interval. Apply no more than 27 fl oz per acre per year. | |
| White rust (Albugo ipomoea-panduratae) | azoxystrobin (Quadris) 2.08 F | 11 | 6.2 to 15.4 fl oz/acre | 7 | 4 hr | Make no more than two sequential applications before alternating with fungicides that have a different mode of action. Apply no more than 2.88 quarts per crop per acre per season. |
| fenamidone (Reason 500SC) | 11 | 5.5 to 8.2 fl oz/acre | 14 | 0.5 | Begin applications when conditions favor disease development, and continue on 5 to 10 day interval. Do not apply more than 16.4 fluid ounces per growing season. Alternate with a fungicide from different resistance management group. | |
| pyraclostrobin (Cabrio) 20 WG | 11 | 8 to 16 oz/acre | 0 | 0.5 | Do not apply more than 48 ounces per acre per season. Alternate with a fungicide with a different mode of action after each use. |
Efficacy of Products for Disease Control
Table Scale: E = excellent; G = good; F = fair; P = poor; NC = no control; ND = no data
| Active Ingredient | Product | Fungicide Group | Nematicide (N) or Fungicide (F) | Alternaria leaf spot | Black rot (C. fimbriata) | Fusarium | Java black rot (D. gossypina) | Pythium | Rhizopus soft rot (R. stolonifer) | Southern blight (S. rolfsii) | Sclerotinia | Scurf (M. infuscans) | Soil rot/Pox (S. ipomoea) | Sweetpotato Feathery Mottle virus |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| azoxystrobin + fludioxonil + difenoconazole | Stadium | 11+12+3 | F | ND | E | ND | ND | ND | E | ND | ND | ND | ND | NC |
| boscalid | Endura | 7 | F | ND | ND | ND | ND | ND | ND | ND | E | ND | ND | NC |
| chlorine sanitizer postharvest | F | ND | F | ND | P | ND | F | ND | ND | P | NC | NC | ||
| chloropicrin | N, F | ND | P | F | F | ND | ND | F | ND | ND | F | NC | ||
| Coniothyrium minitans | Contans WG | F | ND | ND | ND | ND | ND | ND | ND | F | ND | ND | NC | |
| cyazofamid | Ranman | 21 | F | ND | ND | ND | ND | ND | ND | ND | ND | ND | ND | NC |
| dicloran | Botran 75W | 14 | F | ND | P | ND | P | ND | F | P | G | F | NC | NC |
| 1,3-dichloropropene | Telone II | N | ND | ND | P | ND | ND | ND | ND | ND | ND | ND | NC | |
| difenoconazole + benzovindiflupyr | Aprovia Top | 3+7 | F | ND | ND | ND | ND | ND | E | ND | ND | ND | ND | NC |
| ethaboxam | Elumin | 22 | F | ND | ND | ND | ND | G | ND | ND | ND | ND | ND | NC |
| ethoprop | Mocap | N | ND | ND | ND | ND | ND | ND | ND | ND | ND | ND | NC | |
| fludioxonil | Scholar | 12 | F | ND | F | ND | ND | ND | F | NC | ND | ND | NC | NC |
| fluopicolide | Presidio | 43 | F | ND | ND | ND | ND | G | ND | ND | ND | ND | ND | NC |
| fluopyram | Velum Prime | 7 | N, F | ND | ND | ND | ND | ND | ND | ND | ND | ND | ND | NC |
| mefenoxam | Ridomil Gold | 4 | F | ND | ND | ND | ND | G | ND | ND | ND | ND | ND | NC |
| metconazole | Quash | 3 | F | ND | E | ND | ND | ND | ND | ND | ND | ND | ND | NC |
| metam sodium | Vapam | N | ND | P | F | ND | ND | ND | ND | ND | ND | ND | NC | |
| metalaxyl | MetaStar | 4 | F | ND | ND | ND | ND | F | ND | ND | ND | ND | ND | NC |
| oxamyl | Vydate | N | ND | ND | ND | ND | ND | ND | ND | ND | ND | ND | NC | |
| Pseudomonas syringae | Bio-Save | F | ND | ND | ND | ND | ND | P | ND | ND | ND | ND | NC | |
| thiabendazole | Mertect 340-F | 1 | F | ND | E | P | F | ND | E | F | ND | P | NC | NC |
Alternative Methods for Disease Control
Table Scale: E, excellent; G, good; F, fair; P, poor; NC, no control; ND, no data.
| Strategy | Alternaria leaf spot | Black rot (C. fimbriata) | Fusarium | Java black rot (D. gossypina) | Pythium | Rhizopus soft rot (R. stolonifer) | Sclerotinia | Southern blight | Scurf (M. infuscans) | Soil rot/Pox (S. ipomoea) | Sweetpotato Feathery Mottle virus |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Crop rotation (3 to 4 years) | P | F | F | F | P | NC | F | F | P | F | NC |
| Disease-free planting stock | NC | E | G | G | P | NC | NC | P | E | P | G |
| Resistant cultivars | F | NC | F | F | P | F | F | F | P | G | F |
| Careful handling to reduce mechanical injury | NC | F | F | NC | P | E | F | NC | NC | NC | NC |
| Cutting plants (in beds) above soil line | NC | G | F | F | P | NC | NC | NC | G | P | NC |
| Soil sample for nematode analysis | NC | NC | NC | NC | P | NC | NC | NC | NC | NC | NC |
| Sanitation (equipment, fields, storage houses) | F | E | P | F | P | E | NC | NC | P | NC | NC |
| Manage insects that transmit pathogens | NC | P | NC | NC | P | NC | NC | NC | NC | NC | NC |
| Sulfur added to soil to reduce pH | NC | NC | NC | NC | P | NC | NC | NC | NC | F | NC |
| Prompt curing and proper storage conditions | NC | E | F | F | P | E | NC | NC | NC | NC | NC |
| Site selection (drainage) | P | NC | F | F | E | F | G | P | NC | P | NC |
| Manage insects that cause feeding injuries to roots | NC | G | NC | P | P | P | NC | NC | NC | NC | NC |
| Avoid harvesting when soils are wet | F | G | NC | F | G | F | F | NC | NC | NC | NC |
Louisiana
Tables 7-9. The below tables have been adapted from the 2022 Southeastern US Vegetable Crop Handbook.
Traditional Disease Control: Pesticide Use
| Disease | Material | FRAC Code | Rate of Material Formulation | Minimum Days | Method, Schedule, and Remarks | |
|---|---|---|---|---|---|---|
| Harv. | Reentry | |||||
| Black rot (Ceratocystis fimbriata), scurf (Monilochaetes infuscans), and foot rot (Plenodomus destruens) | thiabendazole (Mertect 340 F) | 3 | 107 fl oz/100 gal | 0.5 | 0.5 | Dip seed roots 1 to 2 minutes and plant immediately. |
| Postharvest black rot (Ceratocystis fimbriata) | thiabendazole (Mertect 340 F) | 3 | 0.42 fl oz per 2,000 lb of roots or 0.42 fl oz/gal | 0.5 | 0.5 | SECTION 18 LABEL ONLY IN NORTH CAROLINA. Postharvest treatment of sweetpotato for control of black rot. Limit to one application during packing. Mist washed roots on a conveyor line, with tumbling action, before packing with 0.42 fl oz of Mertect to each 2,000 lb of roots in sufficient water for complete coverage. Alternatively, dip the roots for 20 seconds in 0.42 fl oz of Mertect per gal of water. Ensure roots are dry before packing. |
| Circular spot (Sclerotium rolfsii), Sclerotial blight (Sclerotium rolfsii), Rhizoctonia stem canker (Rhizoctonia solani), Pythium root rot (Pythium) | azoxystrobin (Quadris) 2.08 F | 11 | 0.4 to 0.8 fl oz/1,000 row feet | — | 4 hr | Make in-furrow or banded applications shortly after transplanting. |
| dichloran (Botran) 5F | 14 | 0.6 qt/7.5 gal (Seed Dip) 5.73 oz in 14 gal/1000 linear feet of plant bed (Plant bed spray) | — | 0.5 | Labeled for Southern blight (Sclerotium rolfsii). Seed dip: Dip seed sweetpotatoes 10 to 15 seconds in a well-agitated fungicide suspension. Drain sweet- potatoes and bed promptly. Prepare fresh fungicide suspension daily. Plant bed spray: Spray or sprinkle over bedded sweetpotatoes before covering them with soil. Note: Not for use in Virginia, Tennessee, or South Carolina. |
|
| fluazinam (Omega) 500F | 29 | 5.5 to 8 fl oz/acre | 14 | 0.5 | Labeled for control of white mold (Sclerotinia). Begin applications when plants are 6 to 8 inches tall. Repeat applications at intervals of 7 to 10 days. See label for rate. Do not apply more than 3.5 pints per acre per year. | |
| Seed-borne and soilborne fungi that cause decay, damping off or seedling blight | azoxystrobin (Dynasty) 0.83 F | 11 | 0.19 to 0.38 fl oz per 100 lb of propagating roots | — | 4 hr | Apply uniformly to seed roots as a water-based slurry. |
| fludioxonil (Maxim 4 FS) | 12 | 0.08 to 0.16 fl oz/100 lb of propagating roots | — | 0.5 | Apply uniformly to seed roots as a water-based slurry. | |
| Damping off (Pythium spp.) | cyazofamid (Ranman 400SC) | 21 | 6.1 fl oz/acre | 7 | 0.5 | Apply at planting. Refer to label for details. |
| ethaboxam (Elumin) | 22 | 8 fl oz/acre | _ | 0.5 | Apply in-furrow or as a side dressing over seed piece. Do not make more than two applications per year or apply more than 16 fl oz per acre per year. | |
| fluopicolide (Presidio) | 43 | 3 to 4 fl oz/acre | 7 | 0.5 | Must be tank mixed with a labeled rate of another fungicide active against the target pathogen, but with a different mode of action. Repeat applications at 10-day intervals. | |
| mefenoxam (Ridomil Gold) 4 SL | 4 | 1 to 2 pt/treated acre | _ | 2 | Incorporate in soil. See label for row rate. | |
| metalaxyl (MetaStar) 2 E | 4 | 4 to 8 pt/treated acre | 7 | 2 | Preplant incorporated or soil surface spray. | |
| Foliar diseases (Alternaria) | azoxystrobin (Aframe, generic) | 11 | 6 to 15.5 fl oz/acre | 0 | 4 hr | Limit to 123 fl oz per acre per season. For soilborne disease control, refer to label. Begin foliar applications prior to disease and continue on a 5- to 7-day interval. |
| cyprodinil + fludioxonil (Switch 62.5WG) | 9 + 12 | 11 to 14 oz/acre | 7 | 0.5 | Begin foliar applications prior to disease and continue on a 7- to 10-day interval. | |
| difenoconazole + benzovindiflupyr (Aprovia Top) | 7 + 3 | 10.5 to 13.5 fl oz/acre | 14 | 0.5 | No more than two applications can be made at a 7-day interval; all other applications must be made at a 14-day interval. Apply no more than 27 fl oz per acre per year. | |
| fenamidone (Reason 500SC) | 11 | 5.5 to 8.2 fl oz/acre | 14 | 0.5 | Begin foliar applications prior to disease and continue on a 5- to 10- day interval. | |
| fluoxastrobin (Aftershock) | 11 | 2 to 3.8 fl oz/acre | 7 | 0.5 | Limit to 22.8 fl oz per acre per year. For soilborne disease control, refer to label. Begin foliar applications prior to disease and continue on a 7- to 10-day interval. | |
| pydiflumetofen + fludioxonil (Miravis Prime) | 7+12 | 6.8 fl oz/acre | 7 | 0.5 | Limit to 20.4 fl oz/acre per year. Begin applications prior to disease development. Continue applications through season on a 7- to 10-day interval. | |
| pyraclostrobin (Cabrio) 20 WG | 11 | 8 to 12 oz/acre | 0 | 0.5 | Do not apply more than 48 fl oz per acre per season. Alternate with a fungicide with a different mode of action after each use. | |
| pyrimethanil (Scala SC) | 9 | 7 fl oz/acre | 7 | 0.5 | Begin foliar applications prior to disease and continue on a 7- to 14- day interval. | |
| trifloxystrobin (Flint Extra) | 11 | 3 to 3.8 oz/acre | 7 | 0.5 | Apply on a 7 to 10 day interval as needed. Do not make more than six applications per year or apply more than 23 fl oz per acre per year. | |
| Postharvest Fusarium rot (Fusarium, Albugo ipomoea-panduratae) | azoxystrobin + fludioxonil + difenoconazole (Stadium) | 11 + 12+ 3 | 1 fl oz per 2,000 lbs of roots | _ | _ | Ensure proper coverage, use tumbling, and mix the fungicide solution in sufficient water volume. Do not make more than one postharvest application. |
| Mottle necrosis (Pythium postharvest) | potassium phosphite (Allude) | P07 | 1¼ quarts/acre | 0 | 4 hr | Foliar spray at 5- to 14-day intervals depending on disease incidence. |
| Powdery mildew | azoxystrobin+ difenoconazole (Quadris Top) | 11 + 3 | 8 to 14 fl oz/acre | 14 | 0.5 | Begin foliar applications prior to disease and continue on a 7- to 14-day interval. |
| cyprodinil + fludioxonil (Switch 62.5WG) | 9 + 12 | 11 to 14 oz/acre | 7 | 0.5 | Begin foliar applications prior to disease and continue on a 7- to 10-day interval. | |
| difenoconazole + benzovindiflupyr (Aprovia Top) | 7 + 3 | 10.5 to 13.5 fl oz/acre | 14 | 0.5 | No more than two applications can be made at a 7-day interval; all other applications must be made at a 14-day interval. Apply no more than 27 fl oz per acre per year. | |
| fluopyram + pyrimethanil (Luna Tranquility) | 7 + 9 | 11.2 fl oz/acre | 7 | 0.5 | Limit to 54.7 fl oz per acre per year. Do not make more than two sequential applications of Group 7-containing fungicides. Labeled for Alternaria and Sclerotinia. Apply at 7- or 14-day intervals. | |
| metconazole (Quash) | 3 | 2.5 to 4 oz/acre | 1 | 0.5 | Begin foliar applications prior to disease and continue on a 7- to 10-day interval. Do not apply more than 16 fl oz per year or four times per year. Do not make more than two sequential applications before alternating with products with different modes of action. | |
| penthiopyrad (Vertisan) | 7 | 0.7 to 24 fl oz/acre | 7 | 0.5 | For soilborne disease control, refer to label. Begin foliar applications prior to disease and continue on a 7- to 14-day interval. | |
| pyraclostrobin (Cabrio) 20 WG | 11 | 8 to 12 oz/acre | 0 | 0.5 | Do not apply more than 48 fl oz per acre per season. Alternate with a fungicide with a different mode of action after each use. | |
| pydiflumetofen + fludioxonil (Miravis Prime) | 7+12 | 6.8 fl oz/acre | 7 | 0.5 | Limit to 20.4 fl oz/acre per year. Begin applications prior to disease development. Continue applications through season on a 7- to 10-day interval. | |
| Postharvest Rhizopus soft rot (Rhizopus) | dicloran (Botran) 75 W | 14 | 1 lb/100 gal | — | — | Spray or dip. Dip for 5 to 10 seconds in well-agitated suspension. Add ½-pound Botran to 100 gallons of treating suspension after 500 bushels treated. Do not rinse. |
| fludioxonil (Scholar 1.9 SC) | 12 | 16 to 32 fl oz/100 gal | — | — | Dip for approximately 30 seconds in well-agitated solution and allow sweetpo-tatoes to drain. Add 8 fl oz to 100 gals after 500 bushels are treated. ALTERNA-TIVELY, mix 16 fl oz in 7 to 25 gal of water, wax/emulsion, or aqueous dilution of wax/oil emulsion. Can also be used to disinfest tanks, refer to label. | |
| White mold (Sclerotinia) | Bacillus amyloliquefaciens (Serifel) | 44 | 4 to 16 oz/acre | 0 | 4 hr | Begin foliar applications shortly after emergence or transplanting and continue on 7- to 10-day intervals. |
| boscalid (Endura) | 7 | 5.5 to 10 oz/acre | 10 | 0.5 | Begin applications prior to disease development and apply again at a 7 to 14 day interval. Do not apply more than 20 fl oz per year. Do not make more than two sequential applications before alternating with products with different modes of action. | |
| Coniothyrium minitans (Contans WG) | — | 1 to 4 lb/acre | 0 | 4 hr | OMRI listed product. Apply to soil surface and incorporate no deeper than 2 inches. Works best when applied prior to planting or transplanting. Do not apply other fungicides for 3 weeks after applying Contans. | |
| fluazinam (Omega 500F, Lektivar 40SC) | 29 | 5.5 to 8 fl oz/acre | 14 | 0.5 | Initiate applications when conditions are favorable for disease development or when disease symptoms first appear. Repeat applications on a 7 to 10 day schedule. Do not apply more than 3.5 pints per year. | |
| metconazole (Quash) | 3 | 4 oz/acre | 1 | 0.5 | Make an application prior to disease development and apply again 14 days later. Do not apply more than 16 fl oz per year or four times per year. Do not make more than two sequential applications before alternating with products with different modes of action. | |
| Pydiflumetofen + difenoconazole (Miravis Top) | 3 + 7 | 13.7 fl oz/acre | 14 | 0.5 | Apply in sufficient volume of water to ensure good coverage. Do not make more than two applications of Miravis Top or other Group 3 and 7 fungicides before alternation with a fungicide that is not in Group 3 or 7. Do not make more than 4 applications at the maximum application rate per year. | |
| Scurf (Monilochaetes infuscans) and Sclerotial blight (Sclerotium rolfsii) | dicloran (Botran) 75 W | 14 | 1 lb/100 gal | — | — | Seed dip: Dip seed sweetpotatoes 10 to 15 seconds in a well-agitated fungicide suspension. Drain sweetpotatoes and bed promptly. Prepare fresh fungicide suspension daily. Plant bed spray: Spray or sprinkle over bedded sweetpotatoes before covering them with soil. |
| thiabendazole (Mertect 340 F) | 3 | 107 fl oz/100 gal | 0.5 | 0.5 | Dip seed roots 1 to 2 minutes and plant immediately. | |
| Southern blight (Sclerotium rolfsii) | dicloran (Botran) 75 W | 14 | 1 lb/100 gal | — | — | Seed dip: Dip seed sweetpotatoes 10 to 15 seconds in a well-agitated fungicide suspension. Drain sweetpotatoes and bed promptly. Prepare fresh fungicide suspension daily. Plant bed spray: Spray or sprinkle over bedded sweetpotatoes before covering them with soil. |
| difenoconazole + benzovindiflupyr (Aprovia Top) | 7 + 3 | 10.5 to 13.5 fl oz/acre | 14 | 0.5 | No more than two applications can be made at a 7-day interval; all other applications must be made at a 14-day interval. Apply no more than 27 fl oz per acre per year. | |
| White rust (Albugo ipomoea-panduratae) | azoxystrobin (Quadris) 2.08 F | 11 | 6.2 to 15.4 fl oz/acre | 7 | 4 hr | Make no more than two sequential applications before alternating with fungicides that have a different mode of action. Apply no more than 2.88 quarts per crop per acre per season. |
| fenamidone (Reason 500SC) | 11 | 5.5 to 8.2 fl oz/acre | 14 | 0.5 | Begin applications when conditions favor disease development, and continue on 5 to 10 day interval. Do not apply more than 16.4 fluid ounces per growing season. Alternate with a fungicide from different resistance management group. | |
| pyraclostrobin (Cabrio) 20 WG | 11 | 8 to 16 oz/acre | 0 | 0.5 | Do not apply more than 48 ounces per acre per season. Alternate with a fungicide with a different mode of action after each use. |
Efficacy of Products for Disease Control
Table Scale: E = excellent; G = good; F = fair; P = poor; NC = no control; ND = no data
| Active Ingredient | Product | Fungicide Group | Nematicide (N) or Fungicide (F) | Alternaria leaf spot | Black rot (C. fimbriata) | Fusarium | Java black rot (D. gossypina) | Pythium | Rhizopus soft rot (R. stolonifer) | Southern blight (S. rolfsii) | Sclerotinia | Scurf (M. infuscans) | Soil rot/Pox (S. ipomoea) | Sweetpotato Feathery Mottle virus |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| azoxystrobin + fludioxonil + difenoconazole | Stadium | 11+12+3 | F | ND | E | ND | ND | ND | E | ND | ND | ND | ND | NC |
| boscalid | Endura | 7 | F | ND | ND | ND | ND | ND | ND | ND | E | ND | ND | NC |
| chlorine sanitizer postharvest | F | ND | F | ND | P | ND | F | ND | ND | P | NC | NC | ||
| chloropicrin | N, F | ND | P | F | F | ND | ND | F | ND | ND | F | NC | ||
| Coniothyrium minitans | Contans WG | F | ND | ND | ND | ND | ND | ND | ND | F | ND | ND | NC | |
| cyazofamid | Ranman | 21 | F | ND | ND | ND | ND | ND | ND | ND | ND | ND | ND | NC |
| dicloran | Botran 75W | 14 | F | ND | P | ND | P | ND | F | P | G | F | NC | NC |
| 1,3-dichloropropene | Telone II | N | ND | ND | P | ND | ND | ND | ND | ND | ND | ND | NC | |
| difenoconazole + benzovindiflupyr | Aprovia Top | 3+7 | F | ND | ND | ND | ND | ND | E | ND | ND | ND | ND | NC |
| ethaboxam | Elumin | 22 | F | ND | ND | ND | ND | G | ND | ND | ND | ND | ND | NC |
| ethoprop | Mocap | N | ND | ND | ND | ND | ND | ND | ND | ND | ND | ND | NC | |
| fludioxonil | Scholar | 12 | F | ND | F | ND | ND | ND | F | NC | ND | ND | NC | NC |
| fluopicolide | Presidio | 43 | F | ND | ND | ND | ND | G | ND | ND | ND | ND | ND | NC |
| fluopyram | Velum Prime | 7 | N, F | ND | ND | ND | ND | ND | ND | ND | ND | ND | ND | NC |
| mefenoxam | Ridomil Gold | 4 | F | ND | ND | ND | ND | G | ND | ND | ND | ND | ND | NC |
| metconazole | Quash | 3 | F | ND | E | ND | ND | ND | ND | ND | ND | ND | ND | NC |
| metam sodium | Vapam | N | ND | P | F | ND | ND | ND | ND | ND | ND | ND | NC | |
| metalaxyl | MetaStar | 4 | F | ND | ND | ND | ND | F | ND | ND | ND | ND | ND | NC |
| oxamyl | Vydate | N | ND | ND | ND | ND | ND | ND | ND | ND | ND | ND | NC | |
| Pseudomonas syringae | Bio-Save | F | ND | ND | ND | ND | ND | P | ND | ND | ND | ND | NC | |
| thiabendazole | Mertect 340-F | 1 | F | ND | E | P | F | ND | E | F | ND | P | NC | NC |
Alternative Methods for Disease Control
Table Scale: E, excellent; G, good; F, fair; P, poor; NC, no control; ND, no data.
| Strategy | Alternaria leaf spot | Black rot (C. fimbriata) | Fusarium | Java black rot (D. gossypina) | Pythium | Rhizopus soft rot (R. stolonifer) | Sclerotinia | Southern blight | Scurf (M. infuscans) | Soil rot/Pox (S. ipomoea) | Sweetpotato Feathery Mottle virus |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Crop rotation (3 to 4 years) | P | F | F | F | P | NC | F | F | P | F | NC |
| Disease-free planting stock | NC | E | G | G | P | NC | NC | P | E | P | G |
| Resistant cultivars | F | NC | F | F | P | F | F | F | P | G | F |
| Careful handling to reduce mechanical injury | NC | F | F | NC | P | E | F | NC | NC | NC | NC |
| Cutting plants (in beds) above soil line | NC | G | F | F | P | NC | NC | NC | G | P | NC |
| Soil sample for nematode analysis | NC | NC | NC | NC | P | NC | NC | NC | NC | NC | NC |
| Sanitation (equipment, fields, storage houses) | F | E | P | F | P | E | NC | NC | P | NC | NC |
| Manage insects that transmit pathogens | NC | P | NC | NC | P | NC | NC | NC | NC | NC | NC |
| Sulfur added to soil to reduce pH | NC | NC | NC | NC | P | NC | NC | NC | NC | F | NC |
| Prompt curing and proper storage conditions | NC | E | F | F | P | E | NC | NC | NC | NC | NC |
| Site selection (drainage) | P | NC | F | F | E | F | G | P | NC | P | NC |
| Manage insects that cause feeding injuries to roots | NC | G | NC | P | P | P | NC | NC | NC | NC | NC |
| Avoid harvesting when soils are wet | F | G | NC | F | G | F | F | NC | NC | NC | NC |
Mississippi
Tables 10-12. The below tables have been adapted from the 2022 Southeastern US Vegetable Crop Handbook.
Traditional Disease Control: Pesticide Use
| Disease | Material | FRAC Code | Rate of Material Formulation | Minimum Days | Method, Schedule, and Remarks | |
|---|---|---|---|---|---|---|
| Harv. | Reentry | |||||
| Black rot (Ceratocystis fimbriata), scurf (Monilochaetes infuscans), and foot rot (Plenodomus destruens) | thiabendazole (Mertect 340 F) | 3 | 107 fl oz/100 gal | 0.5 | 0.5 | Dip seed roots 1 to 2 minutes and plant immediately. |
| Postharvest black rot (Ceratocystis fimbriata) | thiabendazole (Mertect 340 F) | 3 | 0.42 fl oz per 2,000 lb of roots or 0.42 fl oz/gal | 0.5 | 0.5 | SECTION 18 LABEL ONLY IN NORTH CAROLINA. Postharvest treatment of sweetpotato for control of black rot. Limit to one application during packing. Mist washed roots on a conveyor line, with tumbling action, before packing with 0.42 fl oz of Mertect to each 2,000 lb of roots in sufficient water for complete coverage. Alternatively, dip the roots for 20 seconds in 0.42 fl oz of Mertect per gal of water. Ensure roots are dry before packing. |
| Circular spot (Sclerotium rolfsii), Sclerotial blight (Sclerotium rolfsii), Rhizoctonia stem canker (Rhizoctonia solani), Pythium root rot (Pythium) | azoxystrobin (Quadris) 2.08 F | 11 | 0.4 to 0.8 fl oz/1,000 row feet | — | 4 hr | Make in-furrow or banded applications shortly after transplanting. |
| dichloran (Botran) 5F | 14 | 0.6 qt/7.5 gal (Seed Dip) 5.73 oz in 14 gal/1000 linear feet of plant bed (Plant bed spray) | — | 0.5 | Labeled for Southern blight (Sclerotium rolfsii). Seed dip: Dip seed sweetpotatoes 10 to 15 seconds in a well-agitated fungicide suspension. Drain sweet- potatoes and bed promptly. Prepare fresh fungicide suspension daily. Plant bed spray: Spray or sprinkle over bedded sweetpotatoes before covering them with soil. Note: Not for use in Virginia, Tennessee, or South Carolina. |
|
| fluazinam (Omega) 500F | 29 | 5.5 to 8 fl oz/acre | 14 | 0.5 | Labeled for control of white mold (Sclerotinia). Begin applications when plants are 6 to 8 inches tall. Repeat applications at intervals of 7 to 10 days. See label for rate. Do not apply more than 3.5 pints per acre per year. | |
| Seed-borne and soilborne fungi that cause decay, damping off or seedling blight | azoxystrobin (Dynasty) 0.83 F | 11 | 0.19 to 0.38 fl oz per 100 lb of propagating roots | — | 4 hr | Apply uniformly to seed roots as a water-based slurry. |
| fludioxonil (Maxim 4 FS) | 12 | 0.08 to 0.16 fl oz/100 lb of propagating roots | — | 0.5 | Apply uniformly to seed roots as a water-based slurry. | |
| Damping off (Pythium spp.) | cyazofamid (Ranman 400SC) | 21 | 6.1 fl oz/acre | 7 | 0.5 | Apply at planting. Refer to label for details. |
| ethaboxam (Elumin) | 22 | 8 fl oz/acre | _ | 0.5 | Apply in-furrow or as a side dressing over seed piece. Do not make more than two applications per year or apply more than 16 fl oz per acre per year. | |
| fluopicolide (Presidio) | 43 | 3 to 4 fl oz/acre | 7 | 0.5 | Must be tank mixed with a labeled rate of another fungicide active against the target pathogen, but with a different mode of action. Repeat applications at 10-day intervals. | |
| mefenoxam (Ridomil Gold) 4 SL | 4 | 1 to 2 pt/treated acre | _ | 2 | Incorporate in soil. See label for row rate. | |
| metalaxyl (MetaStar) 2 E | 4 | 4 to 8 pt/treated acre | 7 | 2 | Preplant incorporated or soil surface spray. | |
| Foliar diseases (Alternaria) | azoxystrobin (Aframe, generic) | 11 | 6 to 15.5 fl oz/acre | 0 | 4 hr | Limit to 123 fl oz per acre per season. For soilborne disease control, refer to label. Begin foliar applications prior to disease and continue on a 5- to 7-day interval. |
| cyprodinil + fludioxonil (Switch 62.5WG) | 9 + 12 | 11 to 14 oz/acre | 7 | 0.5 | Begin foliar applications prior to disease and continue on a 7- to 10-day interval. | |
| difenoconazole + benzovindiflupyr (Aprovia Top) | 7 + 3 | 10.5 to 13.5 fl oz/acre | 14 | 0.5 | No more than two applications can be made at a 7-day interval; all other applications must be made at a 14-day interval. Apply no more than 27 fl oz per acre per year. | |
| fenamidone (Reason 500SC) | 11 | 5.5 to 8.2 fl oz/acre | 14 | 0.5 | Begin foliar applications prior to disease and continue on a 5- to 10- day interval. | |
| fluoxastrobin (Aftershock) | 11 | 2 to 3.8 fl oz/acre | 7 | 0.5 | Limit to 22.8 fl oz per acre per year. For soilborne disease control, refer to label. Begin foliar applications prior to disease and continue on a 7- to 10-day interval. | |
| pydiflumetofen + fludioxonil (Miravis Prime) | 7+12 | 6.8 fl oz/acre | 7 | 0.5 | Limit to 20.4 fl oz/acre per year. Begin applications prior to disease development. Continue applications through season on a 7- to 10-day interval. | |
| pyraclostrobin (Cabrio) 20 WG | 11 | 8 to 12 oz/acre | 0 | 0.5 | Do not apply more than 48 fl oz per acre per season. Alternate with a fungicide with a different mode of action after each use. | |
| pyrimethanil (Scala SC) | 9 | 7 fl oz/acre | 7 | 0.5 | Begin foliar applications prior to disease and continue on a 7- to 14- day interval. | |
| trifloxystrobin (Flint Extra) | 11 | 3 to 3.8 oz/acre | 7 | 0.5 | Apply on a 7 to 10 day interval as needed. Do not make more than six applications per year or apply more than 23 fl oz per acre per year. | |
| Postharvest Fusarium rot (Fusarium, Albugo ipomoea-panduratae) | azoxystrobin + fludioxonil + difenoconazole (Stadium) | 11 + 12+ 3 | 1 fl oz per 2,000 lbs of roots | _ | _ | Ensure proper coverage, use tumbling, and mix the fungicide solution in sufficient water volume. Do not make more than one postharvest application. |
| Mottle necrosis (Pythium postharvest) | potassium phosphite (Allude) | P07 | 1¼ quarts/acre | 0 | 4 hr | Foliar spray at 5- to 14-day intervals depending on disease incidence. |
| Powdery mildew | azoxystrobin+ difenoconazole (Quadris Top) | 11 + 3 | 8 to 14 fl oz/acre | 14 | 0.5 | Begin foliar applications prior to disease and continue on a 7- to 14-day interval. |
| cyprodinil + fludioxonil (Switch 62.5WG) | 9 + 12 | 11 to 14 oz/acre | 7 | 0.5 | Begin foliar applications prior to disease and continue on a 7- to 10-day interval. | |
| difenoconazole + benzovindiflupyr (Aprovia Top) | 7 + 3 | 10.5 to 13.5 fl oz/acre | 14 | 0.5 | No more than two applications can be made at a 7-day interval; all other applications must be made at a 14-day interval. Apply no more than 27 fl oz per acre per year. | |
| fluopyram + pyrimethanil (Luna Tranquility) | 7 + 9 | 11.2 fl oz/acre | 7 | 0.5 | Limit to 54.7 fl oz per acre per year. Do not make more than two sequential applications of Group 7-containing fungicides. Labeled for Alternaria and Sclerotinia. Apply at 7- or 14-day intervals. | |
| metconazole (Quash) | 3 | 2.5 to 4 oz/acre | 1 | 0.5 | Begin foliar applications prior to disease and continue on a 7- to 10-day interval. Do not apply more than 16 fl oz per year or four times per year. Do not make more than two sequential applications before alternating with products with different modes of action. | |
| penthiopyrad (Vertisan) | 7 | 0.7 to 24 fl oz/acre | 7 | 0.5 | For soilborne disease control, refer to label. Begin foliar applications prior to disease and continue on a 7- to 14-day interval. | |
| pyraclostrobin (Cabrio) 20 WG | 11 | 8 to 12 oz/acre | 0 | 0.5 | Do not apply more than 48 fl oz per acre per season. Alternate with a fungicide with a different mode of action after each use. | |
| pydiflumetofen + fludioxonil (Miravis Prime) | 7+12 | 6.8 fl oz/acre | 7 | 0.5 | Limit to 20.4 fl oz/acre per year. Begin applications prior to disease development. Continue applications through season on a 7- to 10-day interval. | |
| Postharvest Rhizopus soft rot (Rhizopus) | dicloran (Botran) 75 W | 14 | 1 lb/100 gal | — | — | Spray or dip. Dip for 5 to 10 seconds in well-agitated suspension. Add ½-pound Botran to 100 gallons of treating suspension after 500 bushels treated. Do not rinse. |
| fludioxonil (Scholar 1.9 SC) | 12 | 16 to 32 fl oz/100 gal | — | — | Dip for approximately 30 seconds in well-agitated solution and allow sweetpo-tatoes to drain. Add 8 fl oz to 100 gals after 500 bushels are treated. ALTERNA-TIVELY, mix 16 fl oz in 7 to 25 gal of water, wax/emulsion, or aqueous dilution of wax/oil emulsion. Can also be used to disinfest tanks, refer to label. | |
| White mold (Sclerotinia) | Bacillus amyloliquefaciens (Serifel) | 44 | 4 to 16 oz/acre | 0 | 4 hr | Begin foliar applications shortly after emergence or transplanting and continue on 7- to 10-day intervals. |
| boscalid (Endura) | 7 | 5.5 to 10 oz/acre | 10 | 0.5 | Begin applications prior to disease development and apply again at a 7 to 14 day interval. Do not apply more than 20 fl oz per year. Do not make more than two sequential applications before alternating with products with different modes of action. | |
| Coniothyrium minitans (Contans WG) | — | 1 to 4 lb/acre | 0 | 4 hr | OMRI listed product. Apply to soil surface and incorporate no deeper than 2 inches. Works best when applied prior to planting or transplanting. Do not apply other fungicides for 3 weeks after applying Contans. | |
| fluazinam (Omega 500F, Lektivar 40SC) | 29 | 5.5 to 8 fl oz/acre | 14 | 0.5 | Initiate applications when conditions are favorable for disease development or when disease symptoms first appear. Repeat applications on a 7 to 10 day schedule. Do not apply more than 3.5 pints per year. | |
| metconazole (Quash) | 3 | 4 oz/acre | 1 | 0.5 | Make an application prior to disease development and apply again 14 days later. Do not apply more than 16 fl oz per year or four times per year. Do not make more than two sequential applications before alternating with products with different modes of action. | |
| Pydiflumetofen + difenoconazole (Miravis Top) | 3 + 7 | 13.7 fl oz/acre | 14 | 0.5 | Apply in sufficient volume of water to ensure good coverage. Do not make more than two applications of Miravis Top or other Group 3 and 7 fungicides before alternation with a fungicide that is not in Group 3 or 7. Do not make more than 4 applications at the maximum application rate per year. | |
| Scurf (Monilochaetes infuscans) and Sclerotial blight (Sclerotium rolfsii) | dicloran (Botran) 75 W | 14 | 1 lb/100 gal | — | — | Seed dip: Dip seed sweetpotatoes 10 to 15 seconds in a well-agitated fungicide suspension. Drain sweetpotatoes and bed promptly. Prepare fresh fungicide suspension daily. Plant bed spray: Spray or sprinkle over bedded sweetpotatoes before covering them with soil. |
| thiabendazole (Mertect 340 F) | 3 | 107 fl oz/100 gal | 0.5 | 0.5 | Dip seed roots 1 to 2 minutes and plant immediately. | |
| Southern blight (Sclerotium rolfsii) | dicloran (Botran) 75 W | 14 | 1 lb/100 gal | — | — | Seed dip: Dip seed sweetpotatoes 10 to 15 seconds in a well-agitated fungicide suspension. Drain sweetpotatoes and bed promptly. Prepare fresh fungicide suspension daily. Plant bed spray: Spray or sprinkle over bedded sweetpotatoes before covering them with soil. |
| difenoconazole + benzovindiflupyr (Aprovia Top) | 7 + 3 | 10.5 to 13.5 fl oz/acre | 14 | 0.5 | No more than two applications can be made at a 7-day interval; all other applications must be made at a 14-day interval. Apply no more than 27 fl oz per acre per year. | |
| White rust (Albugo ipomoea-panduratae) | azoxystrobin (Quadris) 2.08 F | 11 | 6.2 to 15.4 fl oz/acre | 7 | 4 hr | Make no more than two sequential applications before alternating with fungicides that have a different mode of action. Apply no more than 2.88 quarts per crop per acre per season. |
| fenamidone (Reason 500SC) | 11 | 5.5 to 8.2 fl oz/acre | 14 | 0.5 | Begin applications when conditions favor disease development, and continue on 5 to 10 day interval. Do not apply more than 16.4 fluid ounces per growing season. Alternate with a fungicide from different resistance management group. | |
| pyraclostrobin (Cabrio) 20 WG | 11 | 8 to 16 oz/acre | 0 | 0.5 | Do not apply more than 48 ounces per acre per season. Alternate with a fungicide with a different mode of action after each use. |
Efficacy of Products for Disease Control
Table Scale: E = excellent; G = good; F = fair; P = poor; NC = no control; ND = no data
| Active Ingredient | Product | Fungicide Group | Nematicide (N) or Fungicide (F) | Alternaria leaf spot | Black rot (C. fimbriata) | Fusarium | Java black rot (D. gossypina) | Pythium | Rhizopus soft rot (R. stolonifer) | Southern blight (S. rolfsii) | Sclerotinia | Scurf (M. infuscans) | Soil rot/Pox (S. ipomoea) | Sweetpotato Feathery Mottle virus |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| azoxystrobin + fludioxonil + difenoconazole | Stadium | 11+12+3 | F | ND | E | ND | ND | ND | E | ND | ND | ND | ND | NC |
| boscalid | Endura | 7 | F | ND | ND | ND | ND | ND | ND | ND | E | ND | ND | NC |
| chlorine sanitizer postharvest | F | ND | F | ND | P | ND | F | ND | ND | P | NC | NC | ||
| chloropicrin | N, F | ND | P | F | F | ND | ND | F | ND | ND | F | NC | ||
| Coniothyrium minitans | Contans WG | F | ND | ND | ND | ND | ND | ND | ND | F | ND | ND | NC | |
| cyazofamid | Ranman | 21 | F | ND | ND | ND | ND | ND | ND | ND | ND | ND | ND | NC |
| dicloran | Botran 75W | 14 | F | ND | P | ND | P | ND | F | P | G | F | NC | NC |
| 1,3-dichloropropene | Telone II | N | ND | ND | P | ND | ND | ND | ND | ND | ND | ND | NC | |
| difenoconazole + benzovindiflupyr | Aprovia Top | 3+7 | F | ND | ND | ND | ND | ND | E | ND | ND | ND | ND | NC |
| ethaboxam | Elumin | 22 | F | ND | ND | ND | ND | G | ND | ND | ND | ND | ND | NC |
| ethoprop | Mocap | N | ND | ND | ND | ND | ND | ND | ND | ND | ND | ND | NC | |
| fludioxonil | Scholar | 12 | F | ND | F | ND | ND | ND | F | NC | ND | ND | NC | NC |
| fluopicolide | Presidio | 43 | F | ND | ND | ND | ND | G | ND | ND | ND | ND | ND | NC |
| fluopyram | Velum Prime | 7 | N, F | ND | ND | ND | ND | ND | ND | ND | ND | ND | ND | NC |
| mefenoxam | Ridomil Gold | 4 | F | ND | ND | ND | ND | G | ND | ND | ND | ND | ND | NC |
| metconazole | Quash | 3 | F | ND | E | ND | ND | ND | ND | ND | ND | ND | ND | NC |
| metam sodium | Vapam | N | ND | P | F | ND | ND | ND | ND | ND | ND | ND | NC | |
| metalaxyl | MetaStar | 4 | F | ND | ND | ND | ND | F | ND | ND | ND | ND | ND | NC |
| oxamyl | Vydate | N | ND | ND | ND | ND | ND | ND | ND | ND | ND | ND | NC | |
| Pseudomonas syringae | Bio-Save | F | ND | ND | ND | ND | ND | P | ND | ND | ND | ND | NC | |
| thiabendazole | Mertect 340-F | 1 | F | ND | E | P | F | ND | E | F | ND | P | NC | NC |
Alternative Methods for Disease Control
Table Scale: E, excellent; G, good; F, fair; P, poor; NC, no control; ND, no data.
| Strategy | Alternaria leaf spot | Black rot (C. fimbriata) | Fusarium | Java black rot (D. gossypina) | Pythium | Rhizopus soft rot (R. stolonifer) | Sclerotinia | Southern blight | Scurf (M. infuscans) | Soil rot/Pox (S. ipomoea) | Sweetpotato Feathery Mottle virus |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Crop rotation (3 to 4 years) | P | F | F | F | P | NC | F | F | P | F | NC |
| Disease-free planting stock | NC | E | G | G | P | NC | NC | P | E | P | G |
| Resistant cultivars | F | NC | F | F | P | F | F | F | P | G | F |
| Careful handling to reduce mechanical injury | NC | F | F | NC | P | E | F | NC | NC | NC | NC |
| Cutting plants (in beds) above soil line | NC | G | F | F | P | NC | NC | NC | G | P | NC |
| Soil sample for nematode analysis | NC | NC | NC | NC | P | NC | NC | NC | NC | NC | NC |
| Sanitation (equipment, fields, storage houses) | F | E | P | F | P | E | NC | NC | P | NC | NC |
| Manage insects that transmit pathogens | NC | P | NC | NC | P | NC | NC | NC | NC | NC | NC |
| Sulfur added to soil to reduce pH | NC | NC | NC | NC | P | NC | NC | NC | NC | F | NC |
| Prompt curing and proper storage conditions | NC | E | F | F | P | E | NC | NC | NC | NC | NC |
| Site selection (drainage) | P | NC | F | F | E | F | G | P | NC | P | NC |
| Manage insects that cause feeding injuries to roots | NC | G | NC | P | P | P | NC | NC | NC | NC | NC |
| Avoid harvesting when soils are wet | F | G | NC | F | G | F | F | NC | NC | NC | NC |