Hawaiian Beet Webworm Moth in Illinois
MODERATEInsect
Hawaiian Beet Webworm Moth is currently active in Illinois. Watch your susceptible trees closely and act early.
About Hawaiian Beet Webworm Moth
Found four individuals of the same species on a mature rosemary plant in an east facing yard. 83° F, 42° dew point, 23% humidity, partly cloudy skies. We are fully in the midst of Fall in Arizona, with late October hitting pleasant mid 80s highs and 55-65° lows. These were very reactive to my nearby presence, flitting about the leaves of the rosemary before landing with wings laid flat. Very striking in coloration, with reddish brown wings, white bands, and dark brown markings.
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 Hawaiian Beet Webworm Moth. Always read and follow label directions, and confirm a diagnosis before treating.
Organic control that targets caterpillars when they're young.
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 Illinois arborists →Frequently asked questions
Is Hawaiian Beet Webworm Moth in Illinois?
Hawaiian Beet Webworm Moth is currently active in Illinois. Watch your susceptible trees closely and act early. It was first recorded here on October 30, 2026.
What does Hawaiian Beet Webworm Moth look like?
How do I treat Hawaiian Beet Webworm Moth?
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.