WSU Extension


Caption: Coneworm on pine
Photo by: K. Grey
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Douglas Fir : Coneworms
(revision date: 4/20/2015)

Coneworms attack Douglas fir by boring into shoot tips or stems, especially around wounds, and feeding on the soft bark tissues. The portion of the branch beyond the injured point may die back. Coneworms may also bore into green cones, feed on the soft bark of young growth, or feed inside the bark on the trunk. The coneworms are small and cream-colored or light brown with a darker head. The adult coneworm is a mottled gray moth. Coneworms also attack pines, hemlocks, true firs, and spruces.
Management Options

Non-Chemical Management
  • Remove and destroy infested cones and twigs when possible.
  • Plant non-susceptible conifers where coneworms are a serious pest.
  • Natural enemies of the coneworm are likely.
Select non-chemical management options as your first choice!

Chemical Management

None recommended

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Caption: Coneworm on pine
Photo by: K. Grey
Caption: Coneworm damage
Photo by: L.J. du Toit