Melittia cucurbitae
Destructive moth larvae that bore into squash stems, causing sudden wilting and plant death. One of the most damaging pests of squash and pumpkins.
Adult is a day-flying moth with clear wings and orange-red abdomen. Larvae are white, wrinkled caterpillars up to 1 inch long found inside stems. Sawdust-like frass at stem base indicates infestation.
Sudden wilting of individual vines or entire plant. Sawdust-like frass (excrement) at base of stems. Hollow, rotting stems when split open. Plant collapse and death.
One generation per year in North, two in South. Adults emerge in late June-July, lay eggs at stem base. Larvae bore into stems, feed for 4-6 weeks, then pupate in soil.
Delay planting until early July (after egg-laying). Use row covers until flowering. Plant resistant varieties (butternut, some C. moschata). Destroy crop debris. Rotate planting locations.