Looks like powdery mildew. I get it most years, but oddly, almost always after the plants are already weakened by SVBs. My healthy plants never seem to get mildew.

Thanks for the reply... I wouldn't say it's that cold up here, we've been ranging from 50s to 70s lately, but we've had a good amount of rain lately so I guess the rain has made it a bit colder.

My pic is too small. Let me try this Here is a link that might be useful:

Dave, it is evidently "said" that epsom salt promotes nitrogen uptake by plants. I had never heard that, and I'm not inclined to believe it, but it's part of the reason that epsom salt is considered sort of a gardening magic dust. Yes, a plant in a pot for a year might get rootbound, but I still have no idea how big the pot is compared to the plant. If it hadn't ever been fed, I'm kind of surprised it produced such an abundance of fruit. Edit: Now that I start Googling, it seems that a number of gardening "experts" actually SAY that epsom salt provides nitrogen. Holy cow! It does not. There is an awful lot of misunderstanding everywhere!