Aspen leaf-pocket aphid in Colorado
MODERATEInsect
Aspen leaf-pocket aphid is currently active in Colorado. Watch your susceptible trees closely and act early.
About Aspen leaf-pocket aphid
No idea what this is. Looked like a husk from an insect perhaps. Maybe an erupted cocoon? Not sure if it's ID-able.
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 Aspen leaf-pocket aphid. Always read and follow label directions, and confirm a diagnosis before treating.
Direct-contact control for soft-bodied sap feeders.
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 Aspen leaf-pocket aphid in Colorado?
Connect with ISA Certified Arborists serving Colorado:
Browse all Colorado arborists →Frequently asked questions
Is Aspen leaf-pocket aphid in Colorado?
Aspen leaf-pocket aphid is currently active in Colorado. Watch your susceptible trees closely and act early. It was first recorded here on September 14, 2026.
What does Aspen leaf-pocket aphid look like?
How do I treat Aspen leaf-pocket aphid?
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.