Engraver Beetles Adult Ips attack smaller trees and tops of larger trees, but their preferred host material is fresh pine debris from construction, logging, firewood cutting, or blowdown. Living trees can be attacked and killed once populations have built up in fresh pine debris. Several generations are produced per year. Adults emerge from overwintering material and fly to find new hosts in spring. Males initiate attacks and release chemicals which attract females.
Galleries are distinctive.
Galleries slightly etch the sapwood, hence the common name, engraver beetle. Frequently three galleries originate from the nuptial chamber in the shape of a tuning fork. Adult galleries are open and not packed with boring dust. Pupae turn into adults to complete the cycle. Evidence of attack includes fading foliage, red boring dust in bark crevices and occasionally small pitch tubes on trunks of live trees.