苹果生长后期果实裂纹病发生普遍,为害较重,严重影响苹果的商品价值,应引起足够重视。苹果裂纹病是由于苹果生长前期土壤干旱果肉细胞膨大较慢,苹果生长中后期遇雨细胞迅速膨胀而导致的一种生理病害,发病程度与品种、树龄、树势有密切关系。富士品种发病较重,树龄大、树势弱者发病多而重,树龄小、树势强者少而轻。一、苹果裂纹病发病原因1.环境条件苹果生长发育期间干旱、高温、多风等果园环境突变是裂纹病发生的直接诱因。春季持续干旱,特别是幼果膨大期连续多日 Apple fruit cracking occurs late in the common disease, more serious damage, seriously affecting the value of apples, should be paid enough attention. Apple crack disease is due to premature growth of apple soil pulp cells dilapidated slowly, the growth of the apple during the rainy cells caused by the rapid expansion of a physiological disease, the degree of disease and species, age, tree vigor are closely related. Fuji species heavier incidence, age, tree weak and the incidence of multiple and heavy, small age, trees are strong and less light. First, the causes of apple crack disease 1. Environmental conditions Apple growth and development during drought, high temperature, windy orchard mutations in the orchard environment is a direct cause of crack disease. Drought continued in spring, especially the expansion of young fruit for many days