California Root Borer Beetle

Natural Habitat

Orchards, forests, and residential areas in Western North America

Diet & Feeding

Larvae feed on the roots of various trees and shrubs including fruit and nut trees. Adults typically do not feed or may consume small amounts of plant fluids.

Behavior Patterns

They are primarily nocturnal and are strongly attracted to lights. Males use their large, deeply serrated antennae to detect female pheromones. Their life cycle lasts 3 to 5 years, most of which is spent underground as larvae.

Risks & Benefits

While they have strong mandibles and can pinch if handled, they are not venomous. They are considered agricultural pests because their larvae can damage or kill trees by boring through roots. However, they serve as a food source for various birds and mammals.

Identified on: 6/20/2026