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University of Wyoming Extension

 

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	Considerations for Managing Alfalfa Hay in the Face of Insecticide Resistance: Demonstration and Discussion
	Publication #: B-1389 Date Published: 01/31/2024 Publication Author(s): Tyler Jones Scott Schell Jeremiah Vardiman

Description:

Alfalfa (Medicago sativa L.) is a valuable forage crop grown throughout the United States. Whether baled, chopped for silage, cubed, or pelleted, alfalfa provides high-quality feed for cattle (beef and dairy) and other livestock. Alfalfa market value is directly tied to feed quality, ranging in suitability as utility feed to premium forage for dairy applications.

A rising concern in alfalfa management is the development of alfalfa weevil (Hypera postica) resistance to pyrethroid insecticides. Alfalfa weevil is the most problematic insect pest of alfalfa hay across the western United States. Resistance to pyrethroid-type insecticides (Mode of Action 3A) and the recent discontinuation of chlorpyrifos-based insecticides requires a thorough examination of remaining control options.

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