Diagnosis
Diagnose: Blossom-End Rot on Tomato
Use these observations to decide what to check next.
Confirm the lesion position before changing water or calcium
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.