Diagnose: Blossom-End Rot on Tomato

1. Confirm the lesion position before changing water or calcium
2. Turn the fruit without pulling it from the cluster. Blossom-end rot starts exactly opposite the stem as a pale water-soaked or tan area, then becomes brown to black, leathery, and often sunken while the rest of the fruit stays firm. A puckered corky cavity suggests catfacing, a side or shoulder lesion suggests another injury, and fuzzy or weeping tissue means secondary decay may now be involved.

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