Alfalfa weevils now active throughout Iowa

April 25, 2017 11:39 AM

degree day map for alfalfa weevilA couple weeks ago, I posted an ICM News article talking about alfalfa weevils active in southern and central Iowa. Well, temperatures continue to warm up and now I would expect alfalfa weevils to be active throughout all of the state. I've created a new degree map (see below). It is recommended to start scouting alfalfa fields south of Interstate 80 at 200 degree days and fields north of Interstate 80 at 250 degree days. 

degree day map for alfalfa weevil

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Erin Hodgson Associate Professor

Dr. Erin Hodgson started working in the Department of Entomology at Iowa State University in 2009. She is an associate professor with extension and research responsibilities in corn and soybeans. She has a general background in integrated pest management (IPM) for field crops. Dr. Hodgson's curre...