WSU Extension

Hortsense

True Fir
 
Disease
Annosus root rot 
Armillaria root rot 
Current-season needle necrosis 
Flowers 
Grovesiella canker 
Interior needle blight 
Needle casts 
Phytophthora root rot 
Rust (Pucciniastrum) 
Rust (Uredinopsis) 
Insect
Balsam twig aphid 
Balsam woolly adelgid 
Coneworms 
Giant conifer aphids 
Spruce budworm 
Spruce spider mite 



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Caption: Fir Grovesiella canker
Photo by: R.S. Byther
  
True Fir : Grovesiella canker
(revision date: 4/23/2014)


Biology
Grovesiella canker is a fungal disease found mainly on the lower branches and stems of young trees or the lower branches of older trees. Sunken, dead areas develop on one-year-old and older branches or stems. The affected branch is swollen above the canker and twigs may die back. Young trees may die if a canker girdles the stem. The cankers continue to expand indefinitely. Cankers are not found on the crown or roots of affected trees. Grovesiella canker can be a concern on Christmas tree plantations. White fir and Shasta fir are more susceptible than Noble fir or grand fir.
Management Options


Non-Chemical Management
  • Prune and destroy infected branches on landscape trees. Make pruning cuts well below diseased wood.
Select non-chemical management options as your first choice!

Chemical Management

None recommended

Images

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Caption: Fir Grovesiella canker
Photo by: R.S. Byther
Caption: Fir Grovesiella canker
Photo by: B.M. Johnson