WSU Extension

Hortsense

Douglas Fir
 
Disease
Armillaria root rot 
Laminated root rot 
Rhabdocline needle cast 
Rust 
Stem cankers 
Swiss needle cast 
Upper stem canker 
Yellow-green mottle syndrome 
Insect
Aphids 
Coneworms 
Cooley spruce gall adelgid 
Douglas fir needle midge 
Douglas fir tussock moth 
Douglas fir twig weevil 
Sequoia pitch moth 
Silverspotted tiger moth 
Spruce spider mite 



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


Biology
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

Images

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