research on summer squash fruiting disorders notes that crooked, pinched, hollow, or undersized fruit can result from any of these stresses, and no single physical trait is diagnostic by itself.
One pattern worth watching closely is what happens at the blossom end of the fruit. A small zucchini that simply shrivels and turns yellow within a day or two of the flower opening is often a pollination problem, especially when weather or low bee activity has been an issue.
A fruit that becomes mushy, develops a soft blossom end, or
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