We are having a cool spring, but degree-day information indicates that alfalfa weevil larvae will start to hatch in southern Iowa by the end of the third week in April. Scouting should begin at approximately 200 degree days in fields south of I-80, and at 250 degree days in fields north of I-80. The Iowa map shows the accumulated degree days across the nine crop reporting districts. Proper management of this insect requires timely scouting, correct identification, determination of population levels, and if necessary, cultural or chemical control.
Iowa State University
Rice, Marlin E. and Pope, Richard O., "Alfalfa weevils to hatch soon" (2002). Integrated Crop Management News. 1847.
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