Internal tipburn on cole crops doesn’t kill the plant and it isn’t caused by a pest or pathogen however, it is thought to be an environmental change and nutrient deficiency. Even professional growers may be beset by nutritional deficiencies, irrigation issues, or even excess fertilization which causes damage to their crops. The initial signs of internal tipburn in cole vegetables are at the center of the head wherein the tissue breaks down and turns brown and papery. Although it isn't associated with any fungal diseases, the issue resembles a type of rot.

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Source: Gardening Know How