How to Manage Pests

Pests in Gardens and Landscapes

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
Pacific flatheaded borer adult

Flatheaded borer larva
Flatheaded borer larva


Statewide IPM Program, Agriculture and Natural Resources, University of California
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