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近年来，苹果钙素营养失调症发生相当普遍，并有加重趋势。苹果缺钙引起果实出现苦痘、痘斑等病症，使果实等级和销售价格降低，应引起生产者的高度重视。互．症状苹果叶尖或叶缘变黄，焦枯坏死，植株早衰，嫩叶先沿中脉及叶尖产生红棕色或深褐色坏死区，逐渐扩大。缺钙严重时?
In recent years, Apple calcium dystrophy occurs quite common, and there is an increasing trend. Apple calcium deficiency caused fruit bitter pox, acne and other diseases, so that the level of fruit and lower sales prices, should arouse the attention of producers. mutual. Symptoms Apple tip or leaf margin yellowing, scorching necrosis, plant premature aging, the first leaves along the midrib and tip of the red brown or dark brown necrosis area, and gradually expanded. Calcium deficiency is serious?