Taking an environmentally sensitive approach to pest management


Integrated Pest & Crop Management



AUTHOR

Wayne C. Bailey
University of Missouri
Division of Plant Sciences
(573) 882-2838
baileyw@missouri.edu

Grasshopper Management

Wayne C. Bailey
University of Missouri
(573) 882-2838
baileyw@missouri.edu

Published: July 20, 2010

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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