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.