Answer: It could be squash vine borers eating your plants. If you see holes on the main stem near the soil line and "sawdust" like droppings, then chances are its the vine borer. This year put aluminum foil under the young plants and cover the plants with a floating row cover until the flowers begin to open. The foil confuses the adult fly so they can't lay the eggs and the row cover prevents them from finding the stem. After flowering remove the row cover and check a few times a week for the borers. Ifyou see the damage either cut them out with a razor and bury the stem or inject Bt into the stem to kill the larvae. If you're diligent, you'll save your squash plants.
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