Key Points of Prevention and Control Technology against Pear Powdery Mildew

After fruit harvest in autumn, the prevention and control of pear powdery mildew in pear orchard has not been paid enough attention. [...]high temperature and drought often occur in recent years, so the occurrence of pear powdery mildew is aggravating year by year. When pruning in winter, diseased branches, diseased buds and diseased shoots must be cut off, burned or buried intensively, so as to remove the overwintering bacteria sources. 3.3Strengthen cultivation management Cultivation management should be improved, and chemical fertilizer must be scientifically used, such as reducing the amount of nitrogen fertilizer and increasing the application of high-quality organic fertilizer. According to the specific situation, when there is a wide space between the rows of pear orchard, green manure can be interplanted in the orchard, or covered with grass in the tree. The low-lying pear orchard prone to water accumulation, or pear orchards with dense planting and closed canopy should be timely ditched, and reasonably shaped and pruned, to improve the orchard ventilation and light conditions, which can effectively reduce the incidence of pear powdery mildew. 3.4 Chemical control In spring, the pear tree is sprayed with lime sulphur (1-3 Baume degree] before germination to kill the overwintering bacteria and reduce the initial population number.