Q.Watermelon
Wheat is causing my melons to turn black & leathery on the end?
Downtoearthdigs
Answered on July 28, 2017
It sounds like you are describing Blossom Ent Rot.
https://www.gardeningknowhow.com/edible/fruits/watermelon/blossom-rot-in-watermelons.htm
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