Photo by Chal Landgren, OSU.


Photo by Chal Landgren, OSU.

  • Nutrient excesses, resulting from inappropriate or excessive fertilizer use, can damage or kill trees.

Signs & Symptoms

  • Reddish-brown discoloration or necrosis on the tips of newly developing needles
  • All needles with similar levels of damage (unlike a fungal disease, in which only a few random needles are affected)

Where to Look

  • Damage pattern follows application area. Pay attention to newly planted seedlings and small trees.

Similar Symptoms As

  • Chemical injury

Management Options

  • Match fertilizer applications with tree growth and need.
  • Time fertilizer application for the appropriate season (typically February to March).
  • Calibrate applications.