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What Insecticide Kills Bagworms?

By Joyce Starr ; Updated September 21, 2017

Bagworms are caterpillars that feed on the foliage of plants such as conifers, junipers, oaks and arborvitae. Spray the bagworms while they are still actively eating, for the best control. Use an insecticide such as permethrin, spinosad or trichorfon, according to the University of Illinois. After the pupate stage, spraying has no affect in killing them.

 

About the Author

 

For over 25 years, Joyce Starr has owned businesses dealing with landscape & design, lawn maintenance, specialty herbs and a garden center. She holds certificates in landscape design and xeriscaping. Starr shares her passion for nature in her writing, publishing articles on horticulture, outdoor recreation, travel as well as business.