Blossom end rot is a disease associated with physiological problems such as nutrient deficiency or irregular watering. It affects fruit such as tomatoes, lemons, peppers, apples, eggplant/aubergine and melons.
Blossom end rot (BER) causes the ends of the affected fruit to develop a leathery, blackened scar that rots the fruit, damaging the core. In severe cases the fruit becomes inedible.
BER is usually associated with irregular watering or deficiency of calcium or phosphorous.