A serious disorder of tomato, pepper, cucumber, and eggplant, blossom end rot is an environmental problem (not fungal) most often caused by uneven watering or by calcium deficiency. Blossom end rot symptoms occur on both green and ripe fruits and is identified by water-soaked areas that gradually widen and mature into sunken, brown, leathery spots on the bottom end. Choose resistant vegetable varieties whenever possible. Adding high levels of calcium — bone meal, oyster shell, or gypsum — to the soil at planting time usually prevents this problem from developing. Mulching plants will help conserve moisture and provide a more uniform water supply.
Uzma Niazi (Agronomist)