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Pests
Squash Vine Borer Damage
Commonly affects: Cucurbita pepo, C. maxima, C. moschata (Pumpkin)
A single vine wilts suddenly and severely while the rest of the plant looks fine, often with a small hole and sawdust-like frass visible near the base of the affected vine. Cutting the stem open reveals a fat white-cream larva tunnelling through the tissue.
Potential Causes
- 1Squash vine borer moth larvae tunnelling into the main stem near the soil line
- 2Adult moths laying eggs at the base of vines in early-to-mid summer
- 3Vines left unburied at the nodes, giving borers a single point of entry with no backup rooting
Solution Steps
- 1Slit the affected stem lengthwise with a sharp knife to find and remove the larva, then bury the wounded section in moist soil to encourage new rooting.
- 2Bury vine nodes every 60-90 cm along the main vine to establish backup root systems that survive if one section is damaged.
- 3Wrap the base of young vines with foil or fine mesh to physically block egg-laying.
- 4Remove and destroy vines that collapse completely despite treatment, to reduce the overwintering pupae population in the soil.
Prevention Tip
Bury vine nodes proactively from early in the season â a vine with multiple independent root points can survive a borer attack that would otherwise kill it outright.
