Blossom-end rot (BER) is caused by a localized Ca deficiency in developing fruit. It begins with light tan, water-soaked areas which can then enlarge and turn black and leathery in appearance. Most often the problem occurs at the blossom end of the fruit, but on occasion can occur on the side. It may also occur internally with no visible symptoms on outside of the fruit. Many factors can influence BER. The following conditions may increase BER: low soil Ca, high N rates, using ammoniacal sources of N, high concentrations of soluble K and Mg in the soil, high salinity, low humidity, inadequate soil moisture, damage to root system by nematodes, disease or mechanical means or heavy pruning.
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