Palo Verde Beetle (larva)
Scientific Name: Derobrachus geminatus (larva)
Order & Family: Coleoptera (Beetles), Cerambycidae (Longhorn Beetles)
Size: Larvae can reach impressive sizes, up to 10-13 cm (4-5 inches) in length. Adults are also very large, with body lengths typically ranging from 7-9 cm (2.7-3.5 inches).
Natural Habitat
Arid and semi-arid regions of the Southwestern United States and Mexico, often associated with desert trees and shrubs.
Diet & Feeding
Larvae primarily feed on the decaying or dead roots of various trees, especially mesquite, willow, cottonwood, and the Palo Verde tree. Adults typically do not feed.
Behavior Patterns
As larvae, they tunnel and feed within woody plants for several years (up to 3-5 years) before pupating. Adults are typically short-lived and focus on reproduction. Adults are nocturnally active and can be attracted to lights.
Risks & Benefits
Generally beneficial as decomposers, helping to break down dead wood and recycle nutrients. However, in large numbers, larvae can sometimes stunt the growth or contribute to the decline of stressed or young healthy trees by damaging roots. They are not known to be harmful or poisonous to humans but can deliver a painful bite if handled.
Identified on: 8/16/2025