University of
Nebraska		 Ent Web Logo Department
of Entomology

Insecticides for Control of Grasshoppers in Alfalfa

Updated March 3, 2006 by Keith Jarvi

Economic Threshold:

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 more information, see 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.

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IRAC Mode of Action Classification:
  • Group 1 = Acetylcholine esterase inhibitors; 1A = Carbamates; 1B = Organophosphates
  • Group 3 = Sodium channel modulators
R = Restricted-Use Product
Mode of
Action
Product
Name
Common
Name
Rate
(Formulation/Acre)
Restrictions/Comments
3 R Ambush 2E, 25W, 25WP permethrin 3.2 - 12.8 oz At 6.4 oz or less, no preharvest interval. Over 6.4 oz, preharvest interval of 14 days.
3 R Baythroid XL cyfluthrin 2.0 - 2.8 oz Preharvest interval of 7 days.
1A Carbaryl 4L carbaryl ½ - 1½ qts Preharvest interval of 7 days.
1B Chlorpyrifos 4E chlorpyrifos 1 - 2 pts At 1.0 pt, no grazing or harvest for 14 days. Above 1.0 pt, no grazing or harvest for 21 days.
1B Dimate 4EC
Dimethoate 2.67EC, 400, 4EC		 dimethoate Depends on formulation Preharvest interval of 10 days.
1A R Furadan 4F carbofuran ¼ - ½ pt Preharvest interval of 7 days.
1B R Lorsban 4E chlorpyrifos ½ - 1 pt Preharvest interval of 7 days after ½ pint, 14 days after 1 pint.
1B Malathion 5, 55, 57EC
8 aquamul, 8 EC ULV
Atrapa ULV, Fyfanon ULV		 malathion depends on formulation Preharvest interval depends on formulation. Zero days for many. See label.
1B R Methyl 4EC methyl parathion 1 pt Preharvest interval of 15 days.
3 R Mustang Max zeta-cypermethrin 2.8 - 4.0 oz Preharvest interval of 3 days. 7 days for seed.
1B R Nufos 4E chlorpyrifos ½ - 1 pt Preharvest interval 7 days after ½ pt, 14 days after 1 pt.
3 R Proaxis gamma-cyhalothrin 2.56 - 3.84 oz PHI - 1day forage, 7 days hay.
1A Sevin 80 WSP carbaryl 2/3 - 1 7/8 lbs Preharvest interval of 7 days.
3 R Silencer lambda-
cyhalothrin		 2.56 - 3.84 oz Preharvest interval of 1 day for forage, 7 days for hay.
3 R Taiga Z lambda-
cyhalothrin		 2.56 - 3.84 oz Preharvest interval of 1 day for forage, 7 days for hay.
3 R Warrior lambda-cyhalothrin 2.56 - 3.84 oz Preharvest interval of 7 days for hay, 1 day for forage.
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