No. 5 Article 2/April 25, 2008

Alfalfa Weevil Larvae Should Be Evident in the Southern Half of Illinois

As of April 22, 200 degree-days (base 50°F) had accumulated from January 1 as far north as Adams County, southern Tazewell County, and southern Champaign County, suggesting that alfalfa weevil larvae may be active in alfalfa fields in the southern half of Illinois. As of the same date, 300 degree-days had accumulated along a line from St. Louis, Missouri, to White County. Symptoms of leaf-feeding injury caused by small alfalfa weevil larvae should be evident in several southern Illinois counties. Don't forget to scout alfalfa fields, even though most concern will be directed to planting corn and soybeans.--Kevin Steffey

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