This happened to my yellow crooknecks last year, too. I wonder if their overcrowded conditions played a role... The zucchinis had more space and were more prolific. (There seem to be plenty of bees here, since my neighbors raise honeybees and I grow lots of pollinator-attractant plants and flowers.) I don't know if bees avoid overcrowded plants, but I've given all of the squashes some extra breathing room this year; fingers crossed!
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