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苹果早期落叶病是指苹果的叶片按正常规律不到落叶的时期而造成苹果叶片提前脱落的病害,是引起苹果树提前落叶的各种叶部病害的总称,主要包括褐斑病、轮斑病、圆斑病、灰斑病和斑点病。早期落叶病直接影响树体和果实的正常生长发育、影响有机营养的制造和积累以及花芽分化;严重时引起苹果树秋季二次开花,严重削弱树势,降低树体抗性,造成当年、甚至第二年苹果产量与质量的下降。
Apple early deciduous disease refers to the apple leaves under normal law less than deciduous period caused by the early fall off of apple leaves disease is caused by early apple leaves deciduous various leaf diseases in general, including the brown spot disease, leaf spot disease , Round spot, gray spot and spot disease. Early deciduous diseases directly affect the normal growth and development of the tree and fruit, affecting the manufacture and accumulation of organic nutrition and flower bud differentiation; in severe cases, the second flowering of apple trees is caused in autumn, seriously weakening the tree vigor and decreasing the tree resistance, resulting in the current year, The second year Apple’s production and quality decline.