北京市通州区春季保护地栽培番茄历史悠久,是春季保护地蔬菜种植的主栽蔬菜。近年来,随着保护地蔬菜种植时间的延长,加之长期种植单一品种,连作现象严重,又遇2008年气候异常,6月份多雨,空气潮湿,造成番茄白粉病在本区的发生。1发病情况 Tongzhou District, Beijing, the spring to protect the cultivation of tomatoes has a long history, is the main vegetables in spring protected areas of vegetable cultivation. In recent years, with the prolonged planting of vegetables in the protected areas and the long-term planting of a single species, the phenomenon of continuous cropping is serious. In 2008, when the climate became anomalous, the rainy and humid air in June caused the occurrence of powdery mildew in the area. 1 incidence