Pin- and Shot-Hole Borers, Ambrosia Beetles

(Coleoptera: Scolytidae and Platypodidae)

(3) Symptoms of Pin- and Shot-Hole Borer Attack

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Symptoms of Pin- and Shot-Hole Borer Attack

  • dust-free pin- and shot-holes of 0.5 to 3.0 mm in diameter, there can be over 100 holes per m²
  • wood surrounding the holes shows elongate fungal stains
  • the presence of fine dust or solid cylinders of frass, pushed out of the holes and deposited by beetles on the bark of standing trees or on the surface of logs and timber

  • sap and gum flowing out from the borehole, sometimes with debris or dead beetles stuck to the exudate

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Michael F. Schneider, 1999