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During an outbreak, the density of spongy moth caterpillars can be so high that many host trees are heavily or even completely defoliated. To contact an expert in your area, visit https://extension.msu.edu/experts, or call 888-MSUE4MI (888-678-3464). But that can be costly: If youre going to push back with a properly timed spray of a biological insecticide containing Bacillus thuringiensis var. Identification Chart for the Garden Caterpillars Pictured in This Guide. They feed on the leaves of multiple deciduous trees and shrubs in Michigan and are typically found on the upper surfaces of leaves. These values respectively correspond to ultraviolet, blue, and green wavelengths. They can become an occasional pest on various crops. Similarly, the subspecies Deilephila elpenor szechuana is now thought to be a synonym for Deilephila elpenor elpenor. This involves the large eyespots on its hindwings, which give the moth its name (from the cyclops Polyphemus in Greek mythology). A healthy tree can lose up to 50 percent of its leaves before it needs to produce a replacement set, said Andrea Diss-Torrance, the invasive forest insects program coordinator for the Wisconsin Department of Natural Resources. Bt only works well against smaller caterpillars and stops caterpillar feeding but takes several days to kill. Until this year, the only spongy moths I had encountered were the winged adults the occasional males I counted in nighttime surveys every July, during the citizen-science events of National Moth Week. [7], D. elpenor feed on nectar from flowers. However, all three types of photoreceptors remain functional in various light conditions for D. elpenor, giving it the ability to have scotopic colour vision. Black swallowtail. Amazing shot, you have captured the moth and grevillia beautifully. It is a shrub that particularly loves sunny locations. The answer is probably yes at least if Im focusing on a few special trees, taking action this fall and in the next growing season. and Leptospermum, Melaleuca and Thryptomene species. The elephant hawk moth has very sensitive eyes that allow it to see colour even at low-light, and it was one of the first species in which nocturnal colour vision was documented in animals. But the difference between butterflies and moths is a human division, he says:In nature, it doesn't really work.