Damage generally occurs at plant emergence but may also occur during middle to late summer, especially during drought seasons. Examine no-till fields and fields next to pastures and other grassy areas where grasshoppers overwinter and develop. Field sprays may be justified when five to eight grasshoppers per square yard are present. Wait until grasshopper numbers exceed this level and feeding injury exceeds 50 percent or more defoliation on 35 percent or more of the plants. Spot treatment is suggested if infestations are confined to smaller areas.
You are viewing records 1 - 5 of 7. Next 2 Records| Insecticide and formulation | Rate of active ingredient per acre | Rate of formulation per acre | Time lmits: Days before harvest | Remarks |
|---|---|---|---|---|
| carbaryl (Sevin XLR 4F) |
1.5 lb | 3.0 pt | 21 | A ground application with at least 15 gallons of diluted spray is preferred. Use 5 gallons of spray per acre for aerial applications. No preharvest waiting period is required for forage. |
| chlorpyrifos (Lorsban 4E) |
0.25-0.5 lb | 0.5-1.0 pt | 30 | Restricted Use: Do not apply more than 1.5 pounds active ingredient per acre per season. Do not treat sweet varieties of sorghum. |
| dimethoate (Dimethoate 4EC) |
0.5 lb | 1.0 pt | 28 | Do not apply after heading. |
| lambdacyhalothrin (Warrior) |
0.02-0.03 lb | 2.56-3.54 fl oz | 21 | Restricted Use: Do not graze livestock or harvest for silage or hay. |
| zeta-cypermethrin (Mustang MAX) |
0.02-0.025 lb | 3.2-4.0 oz | 14-45 | Restricted Use: Pre-harvest intervals are 14 days for grain and stover, or 45 days for forage. Do not make applications closer than 10 days apart. Apply with a minimum spray volume of 2 or 10 gallons per acre by air or ground, respectively. Maximum allowed amount per crop season is 0.125 lb ai per acre. |
