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Blossom end rot. I had it a few years ago on courgettes - https://www.rhs.org.uk/problems/blossom-end-rot
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Hmm, could be but I would be surprised with the amount of rain we've had. The veg patch seems like it's been constantly wet even though we haven't really watered. I was actually worried for a few weeks that the whole patch was waterlogged and roots were going to rot out. I'll at least try watering the trombetta which is in a container a bit more. It is sheltered and south facing so does get blasted when it's hot.
Any idea what's happening to my squash? I've had a few trombetta and courgettes do this where the fruit starts to develop and then yellows and start to rot from the flower end. This one is grown in a pot, but the courgettes in the ground are similar.