Seasonal development
and life cycle—Pacific flatheaded borer
The adult Pacific flatheaded borer blends in well with the bark and is not commonly seen. The females
lay their eggs on injured areas on the trunks of young trees or limbs of older trees. Young larvae feed
under the bark in the rapidly growing outer wood and bore deeper into the trunk to pupate. Excavations
are usually filled with a finely powdered sawdust. There is only one generation a year. | 
Pacific
flatheaded borer adult
Flatheaded
borer larva
|
