苹果白粉病及防治汪朝阳（丽江地区值保植检站，６７４１００）苹果白粉病是由于囊菌亚门叉丝单囊壳属侵染而引起的真菌性病害。该病在丽江地区苹果上发生及为普遍，为害也特别严重，轻者可使新梢变形、落叶、落果；重者可导致果树丧失挂果能力。据查：一般的发病枝率均在... Powdery mildew of apple and its prevention and control Wang Chaoyang (Lijiang Prefecture Plant Protection Station, 674100) Apple powdery mildew is a fungal disease caused by the infection of Ascomycotina simplex. The disease occurs in Lijiang apple and is widespread, damage is also particularly serious, the light can make the shoots deformed, deciduous, deciduous; weight can lead to loss of fruiting ability of fruit trees. According to the investigation: the average incidence of branches are in ...