I have been having issues with winter squash, and zuccini (not summer squash, not 8 ball zuc, not tomato's - well a little very little issues in tomato's, not on cucs - not for a week or two I got no cucs tiny ones disappeared so maybe?).
Everyone theorized calcium issues but tomato's being ok is making me question this. Also it seems to be happening in fruits that are not young - not mature but flower fell off dried and a day or two later BUT it could just be obvious then and there all along.
On 1 zuc plant in particular there are a TON of leaves, and a TON of new leaves, plant looks like a solid ball!
If it is BER it would seem trimming some leaves would help (and also help spotty mildew which always shows up)?
I put down some lime already, hard to tell but it seems to have helped a little, I did not put down a lot.