It's more than halfway through August and my spaghetti plant is, I think, showing signs of bacterial wilt, should I harvest my fruit?
Certified GKH Gardening Expert
If your vines are completely or almost completely wilted, then yes, I would recommend harvesting now since the squash won't grow any bigger. If only a few leaves are wilted you can continue letting the squash grow, just in case it's not bacterial wilt. But remain vigilant since you may have to harvest in a hurry if the plant dies.
The following article says infected plants die in 7-10 days so you'll soon know the answer: