Q: I had problems with bagworms last year on several plants in my landscape, including arborvitae. When do they hatch out, and how can I control them this year? A: Just to clarify, true bagworms construct homes around themselves with leaves and needles of the plants they are infesting. These “bags” end up resembling small cones by the end of the growing season. Eastern tent caterpillars and fall webworms are sometimes called bagworms, but they construct nests out of silk, not leaves. Bagworm hatch coincides with the bloom of Japanese tree lilac. Once young caterpillars have hatched, they will look for new plants to inhabit. Young caterpillars often “balloon” just...
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