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: Sequoia pitch moth
Photo by: S.J. Collman
  
Douglas Fir : Sequoia pitch moth
(revision date: 4/23/2014)


Biology
The larvae of the sequoia pitch moth feed by boring into branches or trunks. At the point where the larva enters the wood, small to large masses of white to pinkish pitch accumulate. The larva feeds locally underneath the pitch mass. Although healthy trees are occasionally attacked, the egg-laying moths are probably attracted to wounds such as those made by spring pruning. The moths may also be attracted to trees undergoing stresses associated with drought or saturated soil. This pest causes mainly aesthetic damage because of the pitch masses. Incidentally, they do not attack Sequoia.
Management Options


Non-Chemical Management
  • Avoid mechanical injury to trunks and branches which may provide sites for infestation.
  • Remove pitch masses and associated larvae by hand.
Select non-chemical management options as your first choice!

Chemical Management

None recommended

Images

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Caption: Sequoia pitch moth
Photo by: S.J. Collman