Blossom end rot on tomato fruit appears at any time during fruit development, but is most common on the first tomatoes of the season. The first symptom is a water-soaked stain on the underside of the tomato flower. It is not a disease, but a physiological change caused by insufficient calcium that the plant absorbs from the substrate. The tissue on the affected fruit is quickly damaged and the area becomes sunken, dark brown or black and leathery.
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