INJURY OF DOUGLAS-FIR TREES BY MATURATION FEEDING OF THE DOUGLAS-FIR HYLESINUS, PSEUDOHYLESINUS NEBULOSUS (COLEOPTERA: SCOLYTIDAE)

Abstract

AbstractFor maturation feeding, the teneral adults of Pseudohylesinus nebulosus (LeConte) infest healthy twigs of Douglas-fir trees, where they excavate short, irregular galleries in the wood. Mechanically damaged twigs and smaller branches then break off, or a canker-like structure, vulnerable to further breakage, develops at the place of feeding. Some silvicultural and forest entomological implications are mentioned.