What is causing my squash plants to wilt?
Squash vine borers are small, whitish caterpillars that tunnel into stems at the base of plants and feed inside the vine, eventually causing the plant to wilt. The adult moth lays its eggs on the stem in May or early June, and the larvae hatch about a week later and immediately tunnel inside the stem. A vigilant gardener will notice entry holes at the base of the plant, surrounded by yellow, sawdust-like droppings. When the droppings are noticed, slit the vine with a sharp knife and remove the larva. Cover the injured area with moist soil so the plant can re-root. The plant’s chances of surviving such “surgery” are much greater if the borer is removed early, before it has had a chance to tunnel very far. If you really want a challenge (and you have good eyes!), keep an eye out for the very tiny reddish-brown eggs laid at the base of the stem in May/early June. If you see them, simply rub them off. The pesticide Thiodan is labeled for use on home garden squash. Plants must be treated be
