Unfortunately, your plants have bacterial wilt. If there are other squash family plants around it, it may also be in the other plants. You can try pulling it up, but be aware the other plants may already be infected. Here is more information on the problem: https://www.gardeningknowhow.com/edible/vegetables/squash/signs-and-treatments-of-squash-wilt.htm
Answered on July 29, 2015
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