套袋是江南一带在果树生产上应用较多的病虫综合防治措施之一。幼果及时套袋后,由于纸袋的隔离和保护,因而对多种果树病虫,如梨的轮纹病、黑星病,桃的褐腐病、炭疽病,以及桃小、梨小、梨大、桃蛀螟等多种食心虫,都可有效地预防;此外还可避免枝叶对果实的磨擦,和风沙、雨雾、冰雹、烈日等对幼果果皮的刺激,使果实色泽柔和、果皮光洁。江南一带农村靠近大中城市,纸袋取材(报纸)容易,成本低廉,制作方便,加上劳力比较充裕,因而得到广泛应用。但生产实践证明,果实套袋后并不能完全抵御病虫害的侵入,会有另外一些病虫“因 Bagging is one of the integrated pest and disease control measures applied in the fruit tree production in Jiangnan area. Fruit bagging in time, due to the isolation and protection of the paper bag, and thus a variety of fruit pests, such as pears rot disease, scab, peach brown rot, anthracnose, and peach small pear small pear In addition, to avoid the friction of branches and leaves on the fruit, and sand, rain and fog, hail, sun and so on the young fruit peel stimulation, so that the fruit color and soft, peel smooth. The rural areas in the south of Yangtze River are close to large and medium-sized cities. The paper bags are easy to read (newspapers), the cost is low, the production is convenient, and the labor force is abundant. Therefore, they are widely used. However, production practice has proved that fruit bagging can not completely resist the invasion of pests and diseases, there will be some other diseases and insect pests