苹果小叶病的综合防治近年来，在本县一些果园调查发现，苹果小叶病发病株率在２０％左右，少数管理粗放的果园发病株率高达８０％。发病树营养生长不良，叶面积减小，光合作用降低，使花芽形成量减少，坐果率低，果实发育不正常，发病严重的植株完全丧失结果能力。有些小... Comprehensive prevention and control of apple leaf disease In recent years, some orchards in the county survey found that the incidence of apple leaf disease plant rate of about 20%, a small number of extensive management orchard disease plant up to 80%. Diseased tree growth poor nutrition, reduced leaf area, reduced photosynthesis, flower bud formation decreased, fruit setting rate is low, abnormal fruit development, the incidence of serious loss of ability of the plant completely. Some small ...