Orange-necked Blister Beetle in California
MODERATEInsect
Orange-necked Blister Beetle is currently active in California. Watch your susceptible trees closely and act early.
About Orange-necked Blister Beetle
Orange-necked Blister Beetle observed in the wild. Research-grade iNaturalist observation.
Symptoms to watch for
Treatment options
Targeted Insecticide Application
Apply appropriate insecticide following label directions. Timing is critical — treat during the vulnerable larval or adult emergence stage for maximum effectiveness.
Biological Control Agents
Introduce or encourage natural predators and parasitoids. Options include releasing predatory beetles, parasitic wasps, or applying Bt (Bacillus thuringiensis) for caterpillar pests.
Infested Material Removal
Prune and destroy infested branches and plant material. Remove fallen debris that may harbor eggs or larvae. Dispose of material away from healthy trees.
Recommended Products & Tools
Helpful supplies for managing Orange-necked Blister Beetle. Always read and follow label directions, and confirm a diagnosis before treating.
Knocks down soft-bodied pests like aphids, mites, and scale crawlers.
Smothers overwintering eggs and crawlers; dormant or summer rates.
Soil-applied protection taken up by the tree for season-long control.
Sharp, clean cuts to remove affected wood — a tree-care essential.
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Need help with Orange-necked Blister Beetle in California?
Connect with ISA Certified Arborists serving California:
Browse all California arborists →Frequently asked questions
Is Orange-necked Blister Beetle in California?
Orange-necked Blister Beetle is currently active in California. Watch your susceptible trees closely and act early. It was first recorded here on October 17, 2026.
What does Orange-necked Blister Beetle look like?
How do I treat Orange-necked Blister Beetle?
Options include: Targeted Insecticide Application, Biological Control Agents, Infested Material Removal. Confirm the diagnosis before treating, and consider a certified arborist for high-value trees.