Sow-thistle Aphid in Oregon
MODERATEInsect
Sow-thistle Aphid is currently active in Oregon. Watch your susceptible trees closely and act early.
About Sow-thistle Aphid
Sow-thistle Aphid 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 Sow-thistle 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 Sow-thistle Aphid in Oregon?
Connect with ISA Certified Arborists serving Oregon:
Browse all Oregon arborists →Frequently asked questions
Is Sow-thistle Aphid in Oregon?
Sow-thistle Aphid is currently active in Oregon. Watch your susceptible trees closely and act early. It was first recorded here on July 20, 2026.
What does Sow-thistle Aphid look like?
How do I treat Sow-thistle 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.