近年 ,随着套袋技术的广泛应用 ,发现套袋苹果、梨的果面粗糙 ,果锈、红点病、黑点病、皱皮、日灼、裂口等现象越来越重。分析其原因 ,固然受不良的外界气候条件影响较大 ,但与果树谢花至套袋前的幼果期喷药不当也有很大关系。幼果期因表皮组织幼嫩 ,角质层发育不全 ,对外界不? In recent years, with the wide application of bagging technology, it is found that bagging apples and pears are becoming more and more serious with fruit surface roughness, fruit rust, red dot disease, black spot disease, wrinkled skin, sunburn and rips. Analysis of the reasons, of course, affected by adverse external climatic conditions greater, but the fruit tree Xiehua to bagging before the young fruit spray is also a great relationship. Young fruit due to epidermal tissue tender, stratum corneum hypoplasia, to the outside world?