Douglas fir glow-worm in Oregon
MODERATEInsect
Douglas fir glow-worm is currently active in Oregon. Watch your susceptible trees closely and act early.
About Douglas fir glow-worm
In Douglas-fir forest on a Douglas-fir cone. Dark and the light was just visible but magical. I grew up with fireflies in NJ in the 1960s and this is equally as magic to me
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 Douglas fir glow-worm. 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 Douglas fir glow-worm in Oregon?
Connect with ISA Certified Arborists serving Oregon:
Browse all Oregon arborists →Frequently asked questions
Is Douglas fir glow-worm in Oregon?
Douglas fir glow-worm is currently active in Oregon. Watch your susceptible trees closely and act early. It was first recorded here on November 6, 2026.
What does Douglas fir glow-worm look like?
How do I treat Douglas fir glow-worm?
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.