Q.Why Do My Tomatoes Go Black And Rotten On Their Tops?
This years crop

BushDoctor
Certified GKH Gardening Expert
Certified GKH Gardening Expert
Answered on September 13, 2022
It doesn't look like rot to me. To me, it looks like a characteristic of that particular cultivar! Some tomatoes have striation such as this.
This guide will help you to grow tomatoes to their potential:
https://www.gardeningknowhow.com/edible/vegetables/tomato/growing-tomatoes-guide.htm
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