WSU Extension

Hortsense

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

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