University of Nebraska

Department of Entomology

Insecticides for Control of Alfalfa Weevil Adults

Updated March 2, 2006 by Keith Jarvi

Economic Threshold:
Consider treatment if second cutting alfalfa has not started to green up 3 to 5 days after harvest of the first cutting and
6 or more larvae and/or adults are found per crown.

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.

For more information about the biology and management of the alfalfa weevil,
consult NebGuide G94-1208-A, Managing the Alfalfa Weevil and NebGuide G95-1263-A, When to Sample for Alfalfa Weevil.

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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 or 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	Arctic 3.2EC	permethrin	4 - 8 oz	At 4 oz or less, no preharvest interval. Over 4 oz, preharvest interval of 14 days.
3 R	Baythroid XL	cyfluthrin	1.6 - 2.8 oz	Preharvest interval of 7 days.
1B R	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.
1A R	Furadan 4 F	carbofuran	1 - 2 pts	At 1.0 pt, preharvest interval of 14 days. At 2.0 pts, preharvest interval of 28 days.
1B R	Imidan 70-WSB	phosmet	1.3 lbs	Preharvest interval of 7 days.
1B R	Lorsban 4 E	chlorpyrifos	1 - 2 pts	At 1.0 pint, preharvest interval of 14 days. Over 1.0 pint, preharvest interval of 21 days.
1B R	Methyl Parathion 4 E	methyl parathion	1 pt	Preharvest interval of 15 days.
3 R	Mustang Max	zeta- cypermethrin	2.24 - 4.0 oz	3 days preharvest interval.
1B R	Nufos 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 R	Penncap-M	methyl parathion	2 - 3 pts	Preharvest interval of 15 days.
3 R	Permethrin 3.2EC	permethrin	4 - 8 oz	At 4 oz or less, no preharvest interval. Over 4 oz, preharvest interval of 14 days.
3 R	Pounce 3.2 E	permethrin	4 - 8 oz	At 4 oz, no preharvest interval. Over 4 oz, preharvest interval of 14 days.
3 R	Pounce 25 WP	permethrin	6.4 - 12.8 oz	At 6.4 oz, no preharvest interval. Over 6.4 oz, preharvest interval of 14 days.
3 R	Pounce WSB	permethrin	0.1 - 0.2 lb	At 0.1 lb, no preharvest interval. Over 0.1 lb, preharvest interval of 14 days.
3 R	Proaxis	gamma- cyhalothrin	2.56 - 3.84 oz	Preharvest interval of 1 day for forage, 7 days for hay.
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 1 day for forage, 7 days for hay.