苹果银叶病是苹果树遭受紫韧革菌(一种担子菌纲的真菌)侵染所造成的。病树中寄生大量的病菌,病菌在生长过程中分泌一种毒素,这种毒素使叶子表皮和栅栏组织分离,产生离层。光通过离层时,产生折射,使叶子呈银灰色,因此得名银叶病。 潮湿阴雨时,重病树的枝干上长出蘑菇状的子实体,产生大量担孢子,担孢子飞散,落在苹果树的 Silver leaf blight in apple trees is caused by the infection of the apple tree with the genus Vallisneria (a basidiomycete). Sick tree parasites large number of pathogens, germs in the growth process of secretion of a toxin, the toxin leaves the epidermis and palisade tissue separation, resulting in delamination. Light through the separation, resulting in refraction, the leaves were silver gray, so named silver leaf disease. Moist rainy season, the sick tree branches grow mushroom fruiting bodies, resulting in a large number of basidiospores, spores spores, fall on the apple tree