How to Manage Pests

Pests in Gardens and Landscapes

Seasonal development and life cycle—Borers

Adult branch and twig borers are present on vines from early March through May and are often seen walking on canes or feeding on bud axils or shoot crotches. 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.

Egg laying site
Egg laying site
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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