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Adults appear Adults emerge appear in July appear in late attack bark beetle beneath the bark black spruce BORER buds open budworm chew cocoons conifers crevices dark duff early August early July eastern tent Eastern tent caterpillars EGG MASS Eggs are laid Eggs hatch emerge in July Entomology European insect ﬂat Fluid Ounce ﬂy FOREST INSECTS Forest tent caterpillars galls on spruce gray growth GYPSY MOTH hardwoods host inch long infested trees July and lay kill larch Larvae hatch larvae or grubs late June later lay eggs leaf edge LEAF MINERS leaves litter maple mate and lay Mature larvae mid-July moths appear needles numbers occurs Ounce outbreaks overwinter Pints pupae pupate RED PINE sawﬂy shoots singly species Spittle masses Spring Cankerworm stage SUGAR MAPLE tent caterpillar tiny trunk turn brown twigs underside water is equal WEEVIL white pine wing Winter is spent wood yellow yellowish young larvae feed