Blossom end rot is an abiotic disorder caused by a lack of calcium. It typically appears on tomatoes. An insufficient amount of calcium causes the tissue of the fruit to break down leading to characteristic black lesions on the blossom end of the fruit.
Calcium deficiency symptoms appear initially as localized tissue necrosis leading to stunted plant growth, necrotic leaf margins on young leaves or curling of the leaves, and eventual death of terminal buds and root tips. Generally, the new growth and rapidly growing tissues of the plant are affected first. The mature leaves are rarely if ever affected because calcium accumulates to high concentrations in older leaves. Calcium deficiencies in plants are associated with reduced height, fewer nodes, and less leaf area.
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