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Based on accumulated growing degree temperatures, alfalfa weevils are active now in Iowa and scouting should be taking place.

By Rich Pope, Corn and Soybean Initiative and Jon Tollefson, Department of Entomology

The map below indicates the accumulated degree days for each of the nine Iowa crop reporting districts. Degree-day information indicates that alfalfa weevil larvae should be hatching this week in southern Iowa. In central Iowa counties, weevils should be hatching by the third week of April; and in northern Iowa, weevils should hatch the last full week of April. That means that fields in southern Iowa should be scouted now.