Four-spurred Assassin Bug in California
MODERATEInsect
Four-spurred Assassin Bug is currently active in California. Watch your susceptible trees closely and act early.
About Four-spurred Assassin Bug
A tremendous evening with around 75 folks to celebrate moth week! It was the hottest day of the summer so far, so it was a wonderful treat to look for bugs with so many folks. :) Great night!
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 Four-spurred Assassin Bug. 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 Four-spurred Assassin Bug in California?
Connect with ISA Certified Arborists serving California:
Browse all California arborists →Frequently asked questions
Is Four-spurred Assassin Bug in California?
Four-spurred Assassin Bug is currently active in California. Watch your susceptible trees closely and act early. It was first recorded here on August 2, 2026.
What does Four-spurred Assassin Bug look like?
How do I treat Four-spurred Assassin Bug?
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.