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Emerald Ash Borer

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  • ##Emerald ash borer is currently the most damaging threat to ash trees in Wisconsin; the borers only infest ash trees. Actual size of the adult beetle is about half an inch in length.
  • ##Thinning canopies are one of the symptoms of EAB infestation. By the time they are as thin as the photo tree, the tree is in its last year or two of life.
  • ##As larvae feed under the bark they wind back and forth, creating galleries that follow a serpentine pattern.
  • ##When the borers exit trees they leave a small D-shaped emergence hole. The very small hole (1/8 of an inch) is a sign of emerald ash borer infestation.
  • ##Larvae are cream-colored, slightly flattened, with bell-shaped segments and have pincher-like appendages at the end of their abdomen.
  • ##Woodpecker damage called “flecking” looks like pieces of bark have been removed. Flecking occurs when woodpeckers feed on EAB larvae during the winter.

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Last Revised: March 16, 2015