This migratory moth is common throughout the soybean-growing areas of the eastern United States and the Great Plains, but seldom reaches pest status. The caterpillar is green with white and typically has two generations per year. Because it attacks early in the season, however, plants usually compensate for foliage loss before pods are set. Many entomologists consider the green clover worm a valuable food source for beneficial insects and diseases. This reservoir of beneficials often controls pests of more economic importance later in the season. Treat only if defoliation reaches 40% in prebloom, 20% during bloom and pod-fill, and 35% from pod-fill to harvest.
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URL: http://www.soybeans.umn.edu/crop/insects/cloverworm.htm
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