Identification: Yellow clusters on fir

Discussion in 'Gymnosperms (incl. Conifers)' started by Andrey Zharkikh, Aug 12, 2011.

  1. Andrey Zharkikh

    Andrey Zharkikh Well-Known Member 10 Years

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    What causes these things? I see these sporadic clusters of rampant branching with yellow needles on many trees (I think this is Douglas fir, Pseudotsuga menziesii) growing along the coast of a upper mountain lake.
     

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  2. Michael F

    Michael F Paragon of Plants Forums Moderator 10 Years

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    A rust fungus; on Douglas-fir (yes, that's what yours is), either Melampsora medusae or Melampsora occidentalis.

    Other similar diseases occur on other Pinaceae genera.
     
  3. Andrey Zharkikh

    Andrey Zharkikh Well-Known Member 10 Years

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    Thanks, Michael!
     

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