Dimethoate 400 EC has contact and ingestion activity. It may knockback some beneficial, predatory insects in addition to pests. It is probably best used for late season knockback of multiple pest species. It is locally systemic, but its residues last only days. The spray solution should have a pH under 7. Make only two consecutive applications before rotating to an insecticide with a different MOA. Similar products containing dimethoate are available.
| Stage of Development: Emergence to Row Closure | ||||||
|---|---|---|---|---|---|---|
| Pest or Disease | MOA1 | Efficacy2 | Rate per Acre3 | REI4 | PHI5 | Notes |
| Aphid (various species) | 1B | G | 0.5-1.0 pt | 48 h | 0 d | It will knockback aphid populations, but products with longer residual activity are preferred for controlling migratory aphids and limiting Potato Virus Y spread. Better for late season to knockback multiple pests. |
| Beet Leafhopper (Circulifer tenellus) | 1B | P | 0.5-1.0 pt | 48 h | 0 d | It will control BLHs on contact but is not recommended because it provides only a few days of residual control. Products with longer residual activity are more cost-effective for maintaining control of BLH during their migration periods and limiting spread of phytoplasma diseases (e.g., purple top). |
| Lygus Bugs (Lygus species) | 1B | G | 0.5-1.0 pt | 48 h | 0 d | Lygus bugs are on the label but not in the potato section. It will knockback lygus bugs, especially if applied when nymphs are present. |
| Potato Psyllid (Bactericera cockerelli) | 1B | F-P (a) | See Label | 48 h | 0 d | The label doesn’t mention psyllids, but applications made to target other pests will knockback psyllids. Products with longer residuals are preferred for controlling psyllids as they slowly migrate into potatoes. |
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: Tuber Bulking | ||||||
|---|---|---|---|---|---|---|
| Pest or Disease | MOA1 | Efficacy2 | Rate per Acre3 | REI4 | PHI5 | Notes |
| Aphid (various species) | 1B | G | 0.5-1.0 pt | 48 h | 0 d | It will knockback aphid populations, but products with longer residual activity are preferred for controlling migratory aphids and limiting Potato Virus Y spread. Better for late season to knockback multiple pests. |
| Lygus Bugs (Lygus species) | 1B | G | 0.5-1.0 pt | 48 h | 0 d | Lygus bugs are on the label but not in the potato section. It will knockback lygus bugs, especially if applied when nymphs are present. |
| Potato Psyllid (Bactericera cockerelli) | 1B | F-P (a) | See Label | 48 h | 0 d | The label doesn’t mention psyllids, but applications made to target other pests will knockback psyllids. Products with longer residuals are preferred for controlling psyllids as they slowly migrate into potatoes. |
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: Late Tuber Bulking to Harvest | ||||||
|---|---|---|---|---|---|---|
| Pest or Disease | MOA1 | Efficacy2 | Rate per Acre3 | REI4 | PHI5 | Notes |
| Aphid (various species) | 1B | G | 0.5-1.0 pt | 48 h | 0 d | It will knockback aphid populations. |
| Potato Psyllid (Bactericera cockerelli) | 1B | G (a) | See Label | 48 h | 0 d | The label doesn’t mention psyllids, but applications made to target other pests will knockback adult psyllids. |
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.
