Spruce Budworm: Identification & Insecticide Options

Large spruce losing needles on branch tips (~1.5 in back). Owner suspected spruce budworm. Asked verification and treatment.

The expert linked USFS publications for Eastern and Western spruce budworm. Listed registered insecticides: acephate (Orthene), Bt (Dipel, Thuricide), carbaryl (Sevin). Timing: spray 2–3 weeks after budbreak (~mid-June). Ground or aerial application.

Control Options

• Verify via USFS guides.
• Insecticides: Orthene, Bt, Sevin.
• Timing: post-budbreak, mid-June.
• Protect high-value trees.