White grubs are white to cream-colored C-shaped grubs (1/4 inch to 1 1/4 inches long) that feed on the fibrous roots of soybeans. The predominant grubs in Minnesota have a long life cycle of generally 3 years. They attack soybeans following sod throughout the state. In western Minnesota one species may attack soybeans in sandy soil near cottonwoods, poplars, or willows. Their root pruning can lead to stunting and death of plants. No rescue treatments are available and soil insecticides are labeled for white grubs in soybeans. If a problem is anticipated, or if abundant grubs are detected at tillage, consider planting corn with a soil insecticide.
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URL: http://www.soybeans.umn.edu/crop/insects/white_grubs.htm
Last Modified
3/25/11 2:14 PM
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