Green cloverworm: Biology and ecology

Green cloverworm: A green cloverworm, Hypena scabra.Green cloverworm: A green cloverworm, Hypena scabra. (Photo Marlin E. Rice)

Adult green cloverworms migrate from the southern to northern U.S. each spring to produce two generations in Iowa (Pedigo et al. 1973). Eggs are deposited singly on soybean leaves and require about 3 days to hatch. The larvae mature in 14 days after going through about 6 stages. Pupae develop in about 7-10 days. Economic populations of these caterpillars are rare; however, outbreaks can occur when large number migrate north. The large populations are usually suppressed by the fungal pathogen, Nomuraea rileyi.