Bagworm Control on Leyland Cypress: Complete Strategy

Bagworms on 42 Leyland cypresses require multi-tactic approach. Home Depot spray failed likely due to wrong product, timing, or coverage.

Effective Insecticides (thorough coverage essential)

• Acephate (Orthene)
• Bifenthrin (Talstar)
• Carbaryl (Sevin)
• Chlorpyrifos (Dursban)
• Spinosad (contact + ingestion)
• Cyfluthrin (larger larvae)
• Bacillus thuringiensis (BT) - young larvae only, June 15-July 15

Integrated Control Calendar

• Fall-Winter: Hand-pick bags (destroy in soapy water)
• Early spring: Remove bags before hatch
• Mid-June: BT spray if young larvae active
• July: Contact insecticides for larger larvae
• Ongoing: Scout weekly during season

Critical Coverage Note

Bags shed water—spray must penetrate silk. High-pressure sprayer or surfactant helps. For 42 trees, consider professional application with proper equipment. "Bored child" hand-picking works for light infestations.