Taking an environmentally sensitive approach to pest management
As mentioned in a previous newsletter, grasshopper populations are increasing in several regions of the state. Insecticides recommended and economic threshholds for grasshopper management on a variety of crops are listed in the following tables. Be sure to follow label instruction for specific crops being managed.
| Table 1. Grasshoppers in Alfalfa | |||
| Comments: Control grasshoppers when they are small by applying spot treatments to hatching sites in non-cropland areas. Treatment in these areas is justified when grasshopper numbers reach or exceed 15 grasshippers per square yard. | |||
| Common Name | Trade Name | Rate of Formulated Material per acre | Placement |
| beta-cyhalothrin | *Baythroid XL | 2.0 to 2.8 fl oz | broadcast |
| chlorpyrifos + gamma-cyhalothrin | *Cobalt | 7 to 13 fl oz | |
| dimethoate | Dimethoate | see product label | |
| chlorpyrifos | *Lorsban Advanced | 1/2 to 1 pt | |
| gamma-cyhalothrin | *Proaxis | 2.56 to 3.84 fl oz | |
| zeta-cypermethrin | *Mustang Max | 2.8 to 4.0 fl oz | |
| carbaryl | Sevin XLR Plus | 1 to 3 pt | |
| cyfluthrin | *Tombstone | 2.8 to 4.0 fl oz | |
| lambda-cyhalothrin | *Warrior | 2.56 fl oz, see dealer for rates | |
| Table 2. Grasshoppers in Field Corn | |||
| Comments: Control grasshoppers when they are small by applying spot treatments to hatching sites in field borders and grass waterways. Treatment is justified in corn field when 7 or more grasshoppers per square yard are present and foliage is being severely damaged. After pollen shed, control may be necessary if grasshoppers are damaging foliage above ear zone. Dimethoate should not be applied to corn during pollen-shed. | |||
| Common Name | Trade Name | Rate of Formulated Material per acre | Placement |
| esfenvalerate | *Asana XL | 5.8 to 9.6 fl oz | broadcast |
| cyfluthrin | *Baythroid XL | 2.1 to 2.8 fl oz | broadcast |
| bifenthrin | *Brigade 2EC | 2.1 to 6.4 fl oz | broadcast |
| chlorpyrifos + gamma-cyhalothrin |
*Cobalt | 7 to 13 fl oz | broadcast |
| dimethoate | Dimethoate 4EC | 1 pt | broadcast |
| bifenthrin | *Fanfare 2EC | 2.1 to 6.4 fl oz | broadcast |
| zeta-cypermethrin + bifenthrin |
*Hero | 2.6 to 6.1 fl oz | broadcast |
| chlorpyrifos | *Lorsban Advanced | 1/2 to 1 pt | broadcast |
| zeta-cypermethrin | *Mustang Max | 2.72 to 4.0 fl oz | broadcast |
| chlorpyrifos | *Nufos 4E | 1/2 to 1 pt | broadcast |
| microencapsulated methyl parathion |
*Penncap-M | 2 to 3 pt | broadcast |
| gamma-cyhalothrin | *Proaxis | 2.56 to 3.84 fl oz | broadcast |
| carbaryl | Sevin XLR Plus | 1 to 3 pt | broadcast |
| cyfluthrin | *Tombstone | 2.1 to 2.8 fl oz | broadcast |
| lambda-cyhalothrin | *Warrior | 2.56 to 3.84 fl oz | broadcast |
| Table 3. Grasshoppers in Grass Pastures | |||
| Comments: Control grasshoppers when they are small by applying spot treatments to hatching sites or in grass pastures. Treatment in these areas is justified when grasshopper numbers reach or exceed 7 grasshoppers per square yard. | |||
| Common Name | Trade Name | Rate of Formulated Material per acre | Placement |
| zeta-cypermethrin | *Mustang Max | 3.2 to 4.0 fl oz | broadcast |
| carbaryl | Sevin XLR Plus | 1 to 4 pt | broadcast |
| lambda-cyhalothrin | *Warrior | 2.56 to 3.84 fl oz | broadcast |
| Table 3. Grasshoppers in Non-Cropland Areas | |||
| Comments: Control grasshoppers when they are small by applying spot treatments to hatching sites in non-cropland areas. Treatment in these areas is justified when grasshopper numbers reach or exceed 15 grasshoppers per square yard. | |||
| Common Name | Trade Name | Rate of Formulated Material per acre | Placement |
| esfenvalerate | *Asana XL | 2.9 to 5.8 fl oz | broadcast |
| zeta-cypermethrin | *Mustang Max | 3.2 to 4.0 fl oz | broadcast** |
| acephate | Orthene 75S | 2 oz to 2 2/3 oz of soluable powder | broadcast |
| carbaryl | Sevin XLR Plus | 1 to 3 pt | broadcast |
| lambda-cyhalothrin | *Warrior | 2.56 fl oz, see dealer for rates | broadcast |
| Table 4. Grasshoppers in Sorghum (milo) | |||
| Comments: Control grasshoppers when they are small by applying spot treatments to hatchingn sites in field borders and grass waterways. Treatment in field is justified when 7 or more grasshoppers per square yard are present. | |||
| Common Name | Trade Name | Rate of Formulated Material per acre | Placement |
| cyfluthrin | *Baythroid XL | 2.0 to 2.8 fl oz | Broadcast |
| chlorpyrifos + gamma-cyhalothrin |
*Cobalt | 7 to 13 fl oz | |
| dimethoate | Dimethoate 4EC | 1/2 to 1 pt | |
| lambda-cyhalothrin | Karate w Zeon Tech | 1.28 to 1.92 fl oz | |
| chlorpyrifos | *Lorsban Advanced | 1 to 2 pt | |
| zeta-cypermethrin | *Mustang Max | 3.2 to 4.0 fl oz | |
| chlorpyrifos | *Nufos 4E | 1 to 2 pt | |
| gamma-cyhalothrin | *Proaxis | 2.56 to 3.84 fl oz | |
| carbaryl | Sevin XLR Plus | 1 to 3 pt | |
| cyfluthrin | *Tombstone | 2.0 to 2.8 fl oz | |
| lambda-cyhalothrin | *Warrior | 2.56 to 3.84 fl oz | |
| Table 5. Grasshoppers in Soybean | |||
| Comments: Treat when defoliation reaches 30% before bloom, 20% bloom to pod fill, or when 5% to 10% of pods are damaged. | |||
| Common Name | Trade Name | Rate of Formulated Material per acre | Placement |
| esfenvalerate | *Asana XL | 5.8 to 9.6 fl oz | Broadcast |
| cyfluthrin | *Baythroid XL | 2.0 to 2.8 fl oz | |
| bifenthrin | *Brigade 2EC | 2.1 to 6.4 fl oz | |
| chlorpyrifos + gamma-cyhalothrin |
*Cobalt | 7 to13 fl oz | |
| dimethoate | Dimethoate 4EC | 1 pt | |
| lambda-cyhalothrin + thiamethoxam |
*Endigo ZC | 3.5 to 4.5 fl oz | |
| zeta-cypermethrin | *Hero | 2.6 to 4.0 fl oz | |
| imadacloprid + cyfluthrin |
*Leverage 2.7 | 3.8 fl oz | |
| chlorpyrifos | *Lorsban Advanced | 1/2 to 1 pt | |
| zeta-cypermethrin | *Mustang Max | 3.2 to 4.0 fl oz | |
| chlorpyrifos | *Nufos 4E | 1/2 to 1 pt | |
| acephate | Orthene 97 | 1/4 to 1/2 lb | |
| microencapsulated methyl parathion |
*Penncap-M | 2 to 3 pt | |
| gamma-cyhalothrin | *Proaxis | 3.2 to 3.84 fl oz | |
| carbaryl | Sevin XLR Plus | 1 to 3 pt | |
| cyfluthrin | *Tombstone | 2.0 to 2.8 fl oz | |
| lambda-cyhalothrin | *Warrior | 3.2 to 3.84 fl oz | |
| Table 6. Grasshoppers in Wheat | |||
| Comments: Treat when defoliation reaches 30% before bloom, 20% bloom to pod fill, or when 5% to 10% of pods are damaged. | |||
| Common Name | Trade Name | Rate of Formulated Material per acre | Placement |
| cyfluthrin | *Baythroid XL | 1.8 to 2.4 fl oz | On foliage |
| chlorpyrifos + | *Cobalt | 7 to 13 fl oz | |
| dimethoate | Dimethoate 4EC | 3/4 pt | |
| lambda-cyhalothrin | *Karate | 1.28 to 1.92 fl oz | |
| zeta-cypermethrin | *Mustang Max | 3.2 to 4.0 fl oz | |
| microencapsulated methyl parathion |
*Penncap-M | 2 to 3 pt | |
| gamma-cyhalothrin | *Proaxis | 2.56 to 3.84 fl oz | |
| carbaryl | Sevin XLR Plus | 1 to 3 pt | |
| lambda-cyhalothrin | *Warrior | 2.56 to 3.84 fl oz | |
| Seed Treatments | Check with seed dealers | ||
| lambda-cyhalothrin | *Proaxis | 3.2 to 3.84 fl oz | |
| carbaryl | Sevin XLR Plus | 1 to 3 pt | |
| lambda-cyhalothrin | *Warrior | 3.2 to 3.84 fl oz | |
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REVISED: June 7, 2012