Douglas fir glow-worm
MODERATEPterotus obscuripennis
Overview
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
- Type
- Insect
- Severity
- MODERATE
- Source
- iNaturalist
Symptoms
Geographic Spread
Treatments
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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Frequently Asked Questions
What is 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
What are the symptoms of Douglas fir glow-worm?
Where is Douglas fir glow-worm currently found?
Douglas fir glow-worm is currently active in Oregon. It has been reported in 1 total state across the United States.
How do I treat Douglas fir glow-worm?
Treatment options for Douglas fir glow-worm include: Targeted Insecticide Application, Biological Control Agents, Infested Material Removal. Treatment approaches may include chemical, biological, cultural, and mechanical methods depending on the severity and context.