Insect & Disease Resource Center

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  Cankerworms

  • Holes or Skeletonization in Leaves
  • Burnt or Scorched Looking Leaves
  • Leaf or Needle Discoloration
  • Dieback or Thinning Canopy

  Cankerworms are caterpillars of several North American moths that have wingless females. Cankerworms feed on the buds and leaves of trees in early spring and can be a major pest.

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  Elm Leaf Beetle

  • Leaf or Needle Discoloration
  • Burnt or Scorched Looking Leaves
  • Holes or Skeletonization in Leaves
  • Leaf or Needle Dropping

  When populations are large, elm leaf beetle larvae and adults can completely defoliate elms. Adults chew small, circular holes. Infested trees appear drought-stricken and brown or scorched. After the beetles feed, only the lacy vein structure of the leaf remains. Leaves quickly turn brown, curl and detach.

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