How to Manage Pests

Pests in Gardens and Landscapes

Seasonal development and life cycle—Branch and twig borers

Adult branch and twig borers are present from early spring through early summer. Males are frequently found attending females while they feed. Eggs are laid singly in protected areas. Larvae emerge in May or June and bore into dead wood where they continue to feed. The larva remains in its burrow for 10 months. It then prepares a hollow cell in which to pupate. Adults emerge from pupae within 2 weeks of pupation.

Branch borer egg laying site
Egg laying site
Branch borer larva
Borer larva
Borer adult
Borer adult
Borer pupa
Borer pupa

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