Orangestriped oakworms killed by disease

The orangestriped oakworm, Anisota senatoria, is a defoliator of all species of oaks, although it prefers white oaks. It had increased to high numbers in central Minnesota in the past few years, but a large number of parasites and predators helped terminate the outbreaks. This year a disease killed all the caterpillars before they had grown to l inch long in an outbreak area in Morrison County, 5 miles south of Little Falls. Many dead caterpillars were still attached to leaf veins or twigs. Historically this insect has survived in this area, but last year some diseased and several live caterpillars were observed.