They are the most damaging home garden pest for squash. Sudden wilting of a vine, as well as sawdust-like excrement coming from holes in the stem are evidence of attack. The immature larvae are white and heavy-bodied. When they are fully grown, they are about one inch long. They feed inside the stem for about four weeks before leaving the plant to pupate in the soil.
Adult moths are red and black, have clear wings and resemble wasps.
Spray toward the base of the plant and lower stems.