The Egyptian alfalfa weevil has been a significant pest of alfalfa hay production for 50 years in California. Extensive research was done in the 1970's to develop an economic threshold for this pest. A level of 20 EAW larvae per sweep was supported by this research and has been extensively used. However, alfalfa cultivars, production practices, economics, etc. have changed significantly since this threshold was developed and a re-evaluation of this level was warranted. In addition, the concern regarding movement of insecticides targeted for EAW control into surface waters has placed an added importance on pinpointing this threshold. Research was conducted in 2002 and 2003 toward this objective.
Species 1: Coleoptera Curculionidae Hypera brunneipennis (Egyptian alfalfa weevil)
Keywords: economic threshold, forage quality
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