Recommended insectides include Asana, Ambush, Pounce, Scout Xtra, Sevin, Lannate, Larvin, and Karate. The greatest number of insects on soybeans are foliage feeders. These include grasshoppers, garden webworms,armyworms, bean leaf beetles, green cloverworms, loopers, blister beetles, and also corn earworms. They may be present at any time during the growing season. Research has shown that considerable foliage loss can be tolerated without yield reductions.
Some worms also feed on blooms in addition to the foliage.
Plants completely stripped of blooms usually rebloom and yield loss is usually not incurred, but maturity is delayed. Treatment levels for foliage feeders is 40 percent defoliation before bloom, and 25 percent defoliation after blooming begins. Recommended insecticides vary depending upon which insect you have. These are listed in the MP-144, or you can call the Extension office for a recommendation. Red rice control is an ongoing battle and cleaning it up in soybeans is our primary method of management.