Root-Knot Nematode Management: Nematicides

North Carolina

Table 1. The below table has been adapted from the 2022 North Carolina Agricultural Chemicals Manual and the NC State Extension Sweetpotato Root-Knot Nematode Factsheet.

Fumigants and Non-Fumigants

Material (Product)	Product Type	Application Method	Rate/Acre	Rate/1000 Ft Row	Schedule and Remarks	Efficacy Against M. incognita	Efficacy Against M. enterolobii
1,3-dichloropropene (Telone II)	Fumigant	See label	15 to 27 gal 153 to 275 lb	See label	See label	Excellent	Good
chloropicrin (Chloropicrin)	Fumigant	See label	48.6 gal 150 to 350 lb	See label	See label	Fair	Poor
ethoprop (Mocap 15G)	Non-Fumigant	Band only	20 to 26 lb	1.6 to 2.1 lb	Incorporate 2 to 4” deep in centered 12 to 15” band (at least 42” row spacing) 2 to 3 wk before planting. Use no more than 1 application per season.	Requires further testing.	Requires further testing.
ethoprop (Mocap EC)	Non-Fumigant	Band only	63.5 to 85.9 fl. oz	5.1 to 6.9 fl. oz	Incorporate 2 to 4” deep in centered 12 to 15” band (at least 42” row spacing) 2 to 3 wk before planting. Use no more than one application per season.	Requires further testing.	Requires further testing.
oxamyl (Vydate L)	Non-Fumigant	Preplant foliar Drip/soil injection Chemigation: In furrow	See label	—	Note: Vydate L is labeled for these crops to manage nematodes and certain insects. However, the label varies by crop, method of application and state. Therefore, follow the label carefully for the best method, rate, and timing.	Good	Poor
fluopyram (Velum Prime)	Non-Fumigant	Chemigation	6.0 to 6.84 fl. oz	—	Apply as post-planting drench, or hill drench. May offer suppression only if root-knot pressure is high and other methods of suppression should also be employed. Velum Prime is also registered to suppress white mold (Sclerotinia sclerotiorum).	Good	Fair
fluensulfone (Nimitz)	Non-Fumigant	Broadcast soil	3.5 to 7.0 pt	N/A	Apply and incorporate 6 to 8” deep at least 7 days before transplanting. Irrigate with 0.5 to 1.0 in. of water 2 to 5 days after application.	Good	Poor
	Non-Fumigant	Banded soil	See label	See label	Table 2 in label specifies rate based on row spacing. Incorporate 6 to 8” deep at least 7 days before transplanting. Irrigate with 0.5 to 1.0 in. water 2 to 5 days after application.	Good	Poor
	Non-Fumigant	Drip irrigation	—	—	Table 3 in label specifies rate based on bed width. Uniformly wet entire bed width and root zone 6 to 8 in. deep at least 7 days before transplanting. Irrigate with 0.5 to 1.0” of water 2 to 5 days after application.	Good	Poor
fluazaindolizine (Reklemel Active)	Non-Fumigant	See label	See label	See label	See label	Requires further testing.	Requires further testing.

Table 2. The below table has been adapted from the Majestene Specimen Label.

Biologicals

Active Ingredient	Method of Application	Rate per Acre	Timing of Application	Comments
Heat-killed Burkholderia spp. strain A396 & Spent Fermentation Media (Majestene)	In-Furrow Directed/Banded Application Broadcast Application and Sprinkler Chemigation	4-8 quarts	At planting. During cultivation. Prior to planting, at planting or shortly thereafter, at transplant or shortly thereafter and in season on a 21-28 day interval as needed to maintain control.	See label.

South Carolina

Table 3. The below table has been adapted from the 2022 Southeastern US Vegetable Crop Handbook.

Disease	Material	FRAC Code	Rate of Material Formulation	Minimum Days		Method, Schedule, and Remarks
				Harv.	Reentry
Nematodes	fluopyram (Velum Prime)	7	6.0 to 6.84 fl oz/acre	7	0.5	Limit to 0.466 lbs fluopyram per acre per year. Do not make more than two sequential applications of Group 7-containing fungicides.

Louisiana

Table 4. The below table has been adapted from the 2022 Southeastern US Vegetable Crop Handbook.

Disease	Material	FRAC Code	Rate of Material Formulation	Minimum Days		Method, Schedule, and Remarks
				Harv.	Reentry
Nematodes	fluopyram (Velum Prime)	7	6.0 to 6.84 fl oz/acre	7	0.5	Limit to 0.466 lbs fluopyram per acre per year. Do not make more than two sequential applications of Group 7-containing fungicides.

Mississippi

Table 5. The below table has been adapted from the 2022 Southeastern US Vegetable Crop Handbook.

Disease	Material	FRAC Code	Rate of Material Formulation	Minimum Days		Method, Schedule, and Remarks
				Harv.	Reentry
Nematodes	fluopyram (Velum Prime)	7	6.0 to 6.84 fl oz/acre	7	0.5	Limit to 0.466 lbs fluopyram per acre per year. Do not make more than two sequential applications of Group 7-containing fungicides.

California

Table 6. The below table has been adapted from information provided by Dr. Scott Stoddard.

Nematode Species	Material (Product)	Product Type	Application Method	Rate/Acre	Schedule and Remarks
Root-knot nematodes (Meloidogyne spp.)	1,3-dichloropropene (Telone)	Fumigant	Shank applications at 18 – 24” into moist soil followed by surface sealing. All applications subject to township caps and time of application restrictions. Fumigation management plan required.	10 – 12 gpa typical. See label for specific guidelines.	Thus far, no management thresholds have been developed, but the general rule is that counts above 100 RKN per pint (500 cc) of soil, taken in the fall while soil is still moist from irrigation has indicated that treatment is warranted.
	Methyldithiocarbamate (Metam sodium, metam potassium)	Fumigant	Shank applications permitted. 9” row spacing at 3”, 6”, and 12” depth into moist soil, followed by soil sealing with light disc or ring-roller. May be applied through sprinklers. Water seal required. Flood applications.	42 – 45 gpa. See label for specific guidelines. 60 to 75 gpa	Permit conditions for pre-plant applications subject to specific county Agriculture Commissioner guidelines. Minimum 100 ft buffers to occupied structures. Fumigation management plan required.
	Ethoprop (Mocap 15G)	Granular nematicide and insecticide	Pre-plant 2-3 weeks before transplanting and incorporated 4” deep. Banded applications to the row.	20 – 26 lbs/A	Restricted use material, limited to 1 application per season.
	Fluensulfone (Nimitz CA) Fluopyram (Velum)	Liquid nematicide Liquid nematicide/fungicide	Broadcast application to soil 7 – 10 days before planting and incorporate to 6” with light disk. Apply via drip tape around 6 and 8 weeks after transplanting.	3.5 – 5.0 pints/A 6.84 oz/A per application	Surface drip applications have not been evaluated. Make 2 applications per season during middle of irrigation set.
	Biologicals: Burkholderia spp. (Majestene) Chromobacterium subtsugae (Grandevo) Paecilomyces lilacinus (MeloCon)	WSG typical	See label for product details. Pre-plant and incorporated common. Drip applications can be made after transplanting.	See label.	OMRI certified. Minimum of two applications, the first application at two weeks after transplanting, and the second application at four to six weeks after transplanting. The in- season use of biologicals does not eliminate the need for pre-plant nematode management.
	Spirotetramat (Movento)	Insecticide	Two foliar applications near or after layby when there is sufficient leaf cover for uptake and movement within the plant.	5 oz/A per application	Suppression only, the addition of other management necessary for control. Maximum 10 oz/A per season. Must be tank mixed with spray additive/adjuvant.

The use of brand names in this publication does not imply endorsement by NC State University or N.C. A&T State University of the products or services named nor discrimination against similar products or services not mentioned.

Recommendations for the use of agricultural chemicals are included in this publication as a convenience to the reader. The use of brand names and any mention or listing of commercial products or services in this publication does not imply endorsement by NC State University or N.C. A&T State University nor discrimination against similar products or services not mentioned. Individuals who use agricultural chemicals are responsible for ensuring that the intended use complies with current regulations and conforms to the product label. Be sure to obtain current information about usage regulations and examine a current product label before applying any chemical. For assistance in North Carolina, contact your local N.C. Cooperative Extension county center.