Great Ash Sphinx in Utah
MODERATEInsect
Great Ash Sphinx is currently active in Utah. Watch your susceptible trees closely and act early.
About Great Ash Sphinx
Green with white markings and a blue tail. A kitten spotted this larva on Ash tree branches that droop to ground level. Was pulling on the tree branches and successfully removed this larva to play with it. Will be raised with plenty of Ash leaves until it is ready to pupate. 4th larva of this species found this month. Two larva found 2 weeks ago were a peachy color and immediately started pupation.
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 Great Ash Sphinx. 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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Browse all Utah arborists →Frequently asked questions
Is Great Ash Sphinx in Utah?
Great Ash Sphinx is currently active in Utah. Watch your susceptible trees closely and act early. It was first recorded here on October 29, 2026.
What does Great Ash Sphinx look like?
How do I treat Great Ash Sphinx?
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.