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University of Nebraska–Lincoln

Department of Entomology

Insecticides for Control of Grasshoppers in Soybean

Updated July 31, 2009

Table of Economic Thresholds:

Grasshopper Population
(Hoppers/Square Yard)		 Field Field
Margin		 Treatment necessary?
Non-economic 0-2 5-10 No
Light 3-7 11-20 Questionable, depends on size, species, type of crop
Moderate 8-14 20-40 Probably
Abundant 15 or more 41 or more Yes

For information on the biology and management of grasshoppers, refer to NebGuide G86-791-A,
A Guide to Grasshopper Control in Cropland, and NebFact 328, A Guide to Grasshopper Control in Cropland.

This list is not inclusive. See http://www.greenbook.net or other resources for additional registrations.
This information is presented in abbreviated form. Be sure to consult the label for additional information and restrictions.

IRAC Mode of Action Classification:
  • Group 1 = Acetylcholine esterase inhibitors; 1A = Carbamates, 1B = Organophosphates
  • Group 3 = Sodium channel modulators
  • Group 15 = Inhibitors of chitin biosynthesis, type 0, Lepidopteran
R = Restricted-Use Product

Mode of
Action
Product
Name
Common
Name
Rate
(Formulation/Acre)
Restrictions/Comments
3 R Asana XL esfenvalerate 5.8 - 9.6 fl oz Do not exceed 0.2 lb ai. per acre per season. Do not feed or graze livestock on treated plants. 21 day harvest interval.
3 R Baythroid 2 cyfluthrin 2.1 - 2.8 fl oz 45 day pre-harvest interval or period before feeding of dry vines. Green foliage may be fed 15 days after last application.
1B Dimethoate 400 dimethoate 1 pt 21-day harvest interval. Do not feed or graze within 5 days of last application.
15 R Dimilin 25W, 2L diflubenzuron 2 fl oz 21-day harvest interval. No more than 2 applications per season. Treat when majority of grasshoppers have reached 2nd - 3rd instar.
3/4A R Leverage 2.7 Imidacloprid + cyfluthrin 3.8 fl oz 45 d pre-harvest interval. Minimum of 7 d interval between applications. Maximum of 11.4 fl oz/acre per crop season. May be applied by ground, air or chemigation.
1B R Lorsban 4E chlorpyrifos ½ - 1 pt Do not apply more than 6 pints per acre per season. Do not apply last treatment within 28 days before harvest, nor apply last two treatments closer than 14 days apart. Do not allow livestock to graze in treated acres or otherwise feed treated forage, hay, or straw to meat or dairy animals.
3 R Mustang zeta-cypermethrin 3.4 - 4.3 fl oz Do not graze or harvest treated soybean forages, straw, or hay for livestock feed. Do not apply more than 0.31 lb per acre per season. 21 day harvest interval.
1B R Penncap-M methyl parathion 2 - 3 pts Do not make more than 2 applications per season. Do not use within 20 days of harvest or grazing.
3 R Proaxis gamma-cyhalothrin 3.2 - 3.84 fl oz Do not apply within 30 days of harvest or more than 0.48 pints per acre per season.
3 R Scout X-TRA tralomethrin 2.28 - 3.41 fl oz Do not graze or harvest treated soybean forage, straw or hay for livestock feed. Do not apply more than 17 fl. oz per acre in one growing season. Do not apply within 21 days of harvest
3 R Warrior
1.0 EC		 lambda-
cyhalothrin		 3.2 - 3.84 fl oz Do not graze or harvest treated soybean forage, straw or hay for livestock feed. Do not apply within 45 days of harvest. Do not apply more than 0.48 pints per acre per season.