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Lab
7: Defoliators (I)
Picture Sheet 3 of 4 |
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Blue spruce heavily infested with bagworms. |  |
Bagworms overwinter as eggs inside wingless females. Females remain in bags their entire lives. |
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Bagworms on arborvitae superficially resemble Douglas fir cones. |  |
Male bagworms fly to mate with females in the bags. |
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Close up of bagworm on twig. |  |
Up to 1000 caterpillars can hatch from each overwintering bagworm female. At first bags are small and difficult to see. Caterpillars cover themselves with freshly cut foliage as they feed. |
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