永寿县地处陕西省渭北旱塬 ,全县栽植苹果近1 2万ｈｍ2 。近年来苹果斑点落叶病发病面积不断扩大 ,发病程度不断加重 ,已由次要病害上升为主要病害。该病具有潜育期短、发病早、扩展快和再侵染率高等特点。1　症状该病主要为害叶片 ,特别是 2 0～ 30天内新生嫩叶。枝梢和果实极 Yongshou County is located in Weibei dry plateau in Shaanxi Province, the county planted nearly 12,000 hm2 of apples. In recent years, apple spotted leaf disease area continues to expand, the incidence increased, has increased from the secondary disease as the main disease. The disease has a short incubation period, early onset, rapid expansion and re-infection rate characteristics. 1 Symptoms The disease is the main damage leaves, especially young leaves within 20 ~ 30 days. Branches and fruit poles