Thread: Black on Tomato
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Old July 11, 2018   #4
Koala Doug
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Join Date: Dec 2017
Location: Detroit
Posts: 582

Looks like blossom end rot to me.

I've seen it where there was no visible sign of the condition until I cut open the fruit. It doesn't always appear at the blossom end or even show the black area on the outside... it can happen anywhere on or in the fruit.
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