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Bagworm damage
(John Obermeyer, Purdue University)
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Common Name: Bagworm - damage
See also: larva

Scientific Name: Psychidae: Thyridopteryx ephemeraeformis

Status: common pest of evergreens and shrubs

Damaging Stage: caterpillar

Injury: Bagworms prefer juniper, arborvitae, spruce, pine, and cedar but also may attack deciduous trees. They can cause severe damage to trees and shrubs as they defoliate the branches.

Action Threshold: Control should be considered if more than 20 bagworms are found on each frond or if plants are especially valuable or susceptible to injury.

Management: Bagworms can be physically picked off of tree branches in the case of a light infestation. When bagworm populations are above the action threshold, both biological and chemical control options are effective. Treating when the bagworms are very young (early June) is most effective.

Purdue Extension Entomology, 901 West State Street, West Lafayette, IN 47907 USA, (765) 494-4554

Department of Entomology | College of Agriculture | Extension

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