Squash Vine Borer (2026)
Squash, pumpkin
Quick answer: Squash Vine Borer attacks squash, pumpkin. Start with the organic/IPM steps below; use the chemical option only if damage escalates, and always follow the product label. Plant later; use row covers until flowering; rotate beds.
Your Squash Vine Borer IPM card
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Squash Vine Borer in California: Reported across the U.S. It's less common in California but can appear; monitor susceptible plants.
Squash Vine Borer
Targets
Squash, pumpkin
Signs
Sudden vine collapse; sawdust-like frass at stem base.
Organic / IPM first
Slit stem and remove borer; mound soil over wound; foil wrap stem base.
Chemical option (follow label)
Apply pyrethrin or spinosad to stems at egg-lay time.
Prevention
Plant later; use row covers until flowering; rotate beds.
More pests
Treatments follow integrated pest management (IPM): identify first, least-toxic fix second. Product specifics and labels vary by state — confirm with your county extension.