套袋是提高苹果果品质量 ,增加经济效益的有效措施之一。但在实践中由于技术操作不规范和外界不利因素的影响 ,往往幼果脱落、烂果等不良现象。在套袋后３～４周出现幼果脱落现象 ,原因是套袋前没有做好疏果工作 ,树体负载量过大。套袋后２～３周发现有些果烂在袋内 ,原因是套 Bagging is one of the effective measures to improve apple fruit quality and increase economic benefits. However, in practice, due to the technical operation is not standardized and unfavorable factors, often young fruit off, rotten fruit and other undesirable phenomena. 3 ~ 4 weeks after bagging young fruit shedding phenomenon, because the bagging is not done before the thinning work, the tree load is too large. 2 ~ 3 weeks after bagging found that some fruit rot in the bag, the reason is set