More than likely, your problem is squash vine borers. If this is indeed the problem, the white, grublike larvae can be found within the stem of the plant by cutting it open. The larvae hatch from eggs laid by a bright-colored, wasplike moth on the foliage or stems. The eggs hatch and the larvae travel down the plant to the stem and literally core it out. To prevent this problem, begin control measures about the time the plants start to bloom by applying labeled insecticides to the base of the plant. Once the grubs are inside the stem identify the hole and use a wire or paper clip to poke the larvae and kill the bore. If infestation is out of control, remove infested plants from the garden to reduce insect populations.
Contact your local Extension office for a list of recommended insecticides.
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