Garden webworm, Achyra rantalis.
The garden webworm, a common webworm, is slender and green with three dark spots arranged in a triangle on the sides of each body segment. Each spot supports at least one hair. Larvae skeletonize the foliage in the protected, webbed area. If disturbed, larvae move backward rapidly. Peak damage occurs July through August with multiple generations possible. The edges of some soybean fields in northeast Kansas became infested during 2001 with high numbers of webworms moving out of harvested alfalfa fields.
Please refer to the most recent version of the Soybean Insect Management Guide for control options.
Page last updated 11/01/2013 by J.P. Michaud.