Squash in my garden did get some kind of wilt and/or mildew. Does not appear to be a vine borer, though. I did have cucumber beetles, and they can spread a disease, so guessing they were part of the problem, along with the wet weather. However, the mounding summer squash has done well. Two plants that still look healthy. I planted two butternut squash that were starts in pots from a garden center. They produced small size butternuts and then succumbed to the wilt type disease, although the growing ends of these vines are still green, but not producing anything. All females turn yellow and fall off before the flower opens. Then I direct-seeded a few large (Goliath?) butternut squash. These did produce larger butternuts as compared to the other vines, but not really huge. These have fared better, but still have a lot of mildew, etc and are also not producing, and any females fall off before they bloom. Overall, I have 10 butternut squash -some are quite small and petite, but otherwise look good.