How to Manage Pests

Pests in Gardens and Landscapes

Seasonal development
and life cycle—Flatheaded Borer

Flatheaded borer females lay their eggs in bark crevices. 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. Pacific flatheaded borer and alder borer have one generation a year. Oak twig girdler takes 2 years to complete its life cycle.

Pacific flatheaded boer 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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Agriculture and Natural Resources, University of California

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