番茄在京郊保护地生产中占一半以上。由于保护地的特定环境条件,如光照不足,通风差,前期一般温度偏低,整个栽种过程中棚内湿度偏高以及栽培管理水平参差不齐等因素,常造成多种病害发生的有利条件。据调查:番茄晚疫病、灰霉病、叶霉病、早疫病、病毒病、菌核病、园纹病、斑枯病等十多种病害每年都有不同程度的发生。其中以晚疫病、灰 Tomatoes occupy more than half of the production in protected areas in Beijing. Due to the specific environmental conditions of the protected area, such as insufficient light, poor ventilation, low general temperature in the early stage, high humidity in the greenhouse during the whole planting process and uneven cultivation management level, many favorable conditions for the occurrence of various diseases are often caused. According to the survey: tomato late blight, gray mold, leaf mold, early blight, viral disease, Sclerotinia sclerotiorum, spot blight more than 10 kinds of diseases every year to varying degrees. Among them are late blight, ash