Browntail Moth Caterpillar Update - Home and Garden IPM from Cooperative Extension - University of Maine Cooperative Extension

Comparison of 3rd instar (lower caterpillar) and 4th instar (upper caterpillar) BTM larvae; On the 4th instar larva, note the fuzzier appearance as well as the white markings on the sides of each body segment. Tom Schmeelk, Maine Forest Service (MFS) FHM entomologist, reports that many browntail moth webs at his read more