All Christmas tree species, especially noble fir

Photo by Chal Landgren, OSU.


  • Environmental stress, such as low light levels or moisture stress, can accelerate the yellowing and dropping of older needles.

Signs & Symptoms

  • Loss of interior, older needles
  • Older needles turn yellow prior to shedding (late summer and early fall)
  • Older needles easily shed from the stems

Where to Look

  • Interior/older needles

Management Options

  • Use mechanical shakers to minimize the problems on harvested trees.
  • Use high-velocity air (leaf blowers) to remove unsightly needles.

Similar Symptoms As

  • Interior needle blight syndrome on noble and grand fir
  • Other fungal needle casts