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: Current-season needle necrosis
Photo by: R.S. Byther
  
True Fir : Current-season needle necrosis
(revision date: 4/23/2014)


Biology
Current-season needle necrosis affects noble fir and grand fir. The cause is unknown, but appears to be a cultural problem due to a mineral deficiency. Shortly after growth begins, the current season's needles develop brown bands. These bands later turn dark or reddish-brown, and may expand to cover the whole needle. The reddish-brown needles drop from the tree. Current-season needle necrosis is not specific to a particular area on the tree. It does not spread between trees.
Management Options


Non-Chemical Management
  • Provide proper culture for trees. Proper irrigation and fertilization can minimize cultural problems.
Select non-chemical management options as your first choice!

Chemical Management

None recommended

Images

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Caption: Current-season needle necrosis
Photo by: R.S. Byther