Root-lesion nematodes (RLNs) are migratory endoparasites (Pratylenchus species) that move freely in and out of roots.
Damage: These nematodes don’t blemish tubers, but they can make plants less vigorous and reduce yields. Damage is directly related to the number of nematodes present, and potatoes can tolerate low numbers without significant issues.
Control: The recommended treatment threshold often depends on the species; it can be as low as 50 nematodes per 100 cc soil for P. penetrans, or as much as 500 nematodes per 100 cc soil for the less aggressive P. neglectus. Pratylenchus penetrans is one of the more destructive species, and it is known to interact with the soilborne fungus, Verticillium dahliae, to cause and increase the severity of early dying disease. Aggressive management of the nematode is recommended when both P. penetrans and V. dahliae are found in the soil, so the treatment threshold may be set as low as 25 nematodes per 100 cc soil.
| Stage of Development: Planting to Pre-emergence | ||||||
|---|---|---|---|---|---|---|
| Pesticide | MOA1 | Efficacy2 | Rate per Acre3 | REI4 | PHI5 | Notes |
| Vydate C-LV oxamyl | 1A | G | 2.1-4.25 pt | 48 h | 7 d | Start with an in-furrow application at planting and follow with foliar applications via chemigation. The in-furrow application is optional but is recommended to risk-averse growers and when following alfalfa. |
1Mode of action. NC = not classified..
2 Efficacy ratings denote the relative ability of a pesticide to control its target. The ratings are E = excellent, G = good, F = fair/suppression; P = poor, and ND = no data. Efficacy ratings are based on the inherent toxicity of the pesticide against its target, the likelihood that the target will contact or ingest the product as applied, duration of impact on the target, and undesired effects, such as negative impacts on natural enemies that could lead to future pest outbreaks.
3 Rate per acre per application. Refer to the product label for maximum use rate per season.
4 Reentry interval.
5The minimum pre-harvest interval. Some products do not list PHI.
Note: always read and follow the directions on the pesticide label.
| Stage of Development: Emergence to Row Closure | ||||||
|---|---|---|---|---|---|---|
| Pesticide | MOA1 | Efficacy2 | Rate per Acre3 | REI4 | PHI5 | Notes |
| Vydate C-LV oxamyl | 1A | G | 2.1 pt | 48 h | 7 d | Apply the first foliar treatment of 2.1 pints/A via chemigation at crop emergence. Follow with three applications of 2.1 pints/A on 14-day intervals. |
1Mode of action. NC = not classified..
2 Efficacy ratings denote the relative ability of a pesticide to control its target. The ratings are E = excellent, G = good, F = fair/suppression; P = poor, and ND = no data. Efficacy ratings are based on the inherent toxicity of the pesticide against its target, the likelihood that the target will contact or ingest the product as applied, duration of impact on the target, and undesired effects, such as negative impacts on natural enemies that could lead to future pest outbreaks.
3 Rate per acre per application. Refer to the product label for maximum use rate per season.
4 Reentry interval.
5The minimum pre-harvest interval. Some products do not list PHI.
Note: always read and follow the directions on the pesticide label.
| Stage of Development: Fall Field Preparation | ||||||
|---|---|---|---|---|---|---|
| Pesticide | MOA1 | Efficacy2 | Rate per Acre3 | REI4 | PHI5 | Notes |
| Telone II dichloropropene | 11 | E-G | 9-25 gal | 5 d | Apply by shanking in at ≥18-inch depth. Use 9-12 gal/A for mineral soils, and 25 gal/A for muck. Soil temperature must be between 40°F and 80°F. | |
1Mode of action. NC = not classified..
2 Efficacy ratings denote the relative ability of a pesticide to control its target. The ratings are E = excellent, G = good, F = fair/suppression; P = poor, and ND = no data. Efficacy ratings are based on the inherent toxicity of the pesticide against its target, the likelihood that the target will contact or ingest the product as applied, duration of impact on the target, and undesired effects, such as negative impacts on natural enemies that could lead to future pest outbreaks.
3 Rate per acre per application. Refer to the product label for maximum use rate per season.
4 Reentry interval.
5The minimum pre-harvest interval. Some products do not list PHI.
Note: always read and follow the directions on the pesticide label.
| Stage of Development: Preplant | ||||||
|---|---|---|---|---|---|---|
| Pesticide | MOA1 | Efficacy2 | Rate per Acre3 | REI4 | PHI5 | Notes |
| Telone II dichloropropene | 11 | E-G | 9-25 gal | 5 d | Apply by shanking in at ≥18-inch depth. Use 9-12 gal/A for mineral soils, and 25 gal/A for muck. Soil temperature must be between 40°F and 80°F. | |
1Mode of action. NC = not classified..
2 Efficacy ratings denote the relative ability of a pesticide to control its target. The ratings are E = excellent, G = good, F = fair/suppression; P = poor, and ND = no data. Efficacy ratings are based on the inherent toxicity of the pesticide against its target, the likelihood that the target will contact or ingest the product as applied, duration of impact on the target, and undesired effects, such as negative impacts on natural enemies that could lead to future pest outbreaks.
3 Rate per acre per application. Refer to the product label for maximum use rate per season.
4 Reentry interval.
5The minimum pre-harvest interval. Some products do not list PHI.
Note: always read and follow the directions on the pesticide label.
