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The larvae and adults of alfalfa weevil (Hypera postica) are the primary defoliators in alfalfa. Heavy infestations can reduce tonnage and forage quality. Use this article to learn how to identify alfalfa weevil and properly scout for and manage this pest.

Identification

Adult: Adult alfalfa weevils are approximately ¼ inch long beetles with a blunt “snout,” thick golden hairs covering the body, and a distinct dark, narrow stripe down the back (Photo 1).