Hello,
yes, heat is my main suspect, too. Definitely with tomatoes, that's why I always plant cabbage south of my tomatoes so that the soil isn't overheated. It really reduces BER occurrence in them. But zucchini and pumpkins, etc. do that job for themselves as they have large leaves that cover the ground. And those in my garden actually developed BER (if it was BER) only in Sep or later. I keep thinking about that, but no clear conclusions yet.
Milan HP
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