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Fir > Shoots/Branch tips > Wilted shoots

1 of 3
  • Frost injury 1

    Credit: USDA Forest Service - North Central Research Station Archive, USDA Forest Service, Bugwood.org

  • Frost injury 2

    Credit: Joseph O'Brien, USDA Forest Service, Bugwood.org

  • Frost injury 3

    Credit: Mn Dept. of Natural Resources

  • - CLICK PHOTOS TO ENLARGE -

green arrowFrost injury

  • New shoots fall over and wilt after a spring frost
  • Older branches remain green and healthy
  • Dead shoot may remain attached all summer; new shoots may grow next to them
  • More information on Frost injury...
2 of 3
  • Growth regulator herbicide damage 1

    Credit: Sandy Kegley, USDA Forest Service, Bugwood.org

  • Growth regulator herbicide damage 2

    Credit: M. Grabowski, University of Minnesota

  • Growth regulator herbicide damage 3

    Credit: M. Grabowski, University of Minnesota

  • - CLICK PHOTOS TO ENLARGE -

green arrowGrowth regulator herbicide damage
(e.g. 2,4D or MCPP)

  • Shoots may wilt or curl
  • Needles stunted, twisted or misshapen but remain green
  • If damage is severe, needles turn brown and fall off, branches may die
  • Symptoms occur a few days to several weeks after herbicide application
  • Dead or dying weeds expressing similar symptoms may be present nearby
  • More information on Growth regulator herbicide damage...
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  • Pine spittlebug 1

    Credit: J. Hahn, University of Minnesota

  • Pine spittlebug 2

    Credit: J. Hahn, University of Minnesota

  • Pine spittlebug 3

    Credit: Herbert A. 'Joe' Pase III, Texas Forest Service, Bugwood.org

  • - CLICK PHOTOS TO ENLARGE -

green arrowPine spittlebug
Aphrophora parallela

  • White foamy mass on twigs and needles May to early June
  • Look within for small (up to ΒΌ inch), black and pale yellow nymphs
  • Heavy infestations can flag and discolor shoots
  • More information on Pine spittlebug...

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