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Elm > Leaves > Unusual projections on leaves

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  • Image: Elm finger gall 1
    Credit: J. Hahn, University Of Minnesota
  • Image: Elm finger gall 2

    Credit: J. Hahn, University Of Minnesota

  • Image: Elm finger gall 3

    Credit: C. Bográn, TX AgriLife Extension Service

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green arrowElm finger gall
Eriophyes ulmi

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  • Image: Elm cockscomb gall aphid 1
    Credit: . Katovich, USDA Forest Service, Bugwood.org
  • Image: Elm cockscomb gall aphid 2

    Credit: H.E. Evans, CO State University, Bugwood.org

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green arrowElm cockscomb gall aphid
Colopha ulmicola and C. graminis

  • Aphid induces a 1 inch long by ¼ inch high wrinkled swelling on the leaf surface, irregular like a rooster’s comb
  • Reddish at first but turning brown as the season progresses
  • Found on American and red elm
  • More information on Leaf galls...
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  • Image: Elm casebearer 1
    Credit: . Zubrik, Forest Research Institute - Slovakia, Bugwood.org
  • Image: Elm casebearer 2

    Credit: . Zubrik, Forest Research Institute - Slovakia, Bugwood.org

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green arrowElm casebearer
Coleophora ulmifoliella

  • Larvae mine angular spots between leaf veins causing brown areas that can coalesce to complete browning in high infestations
  • Create cigar-shaped cases out of leaf tissue and silk that hang from leaf underside
  • Preferred hosts are American, red, and slippery elm
  • More information on Elm casebearer...

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