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目前,全国主要蔬菜年种植面积2.7亿亩,其中病虫害发生面积3.5亿亩次左右。全国农业技术推广服务中心测报处根据各地测报结果分析,近年来病虫害发生特点是:新的病虫害发生,次要病虫为害上升,土传病害、地下害虫加重,已严重影响蔬菜的安全生产。据调查,北京郊区保护地蔬菜根结线虫病发生日益普遍、为害日益加重;番茄溃疡病、黄瓜黑星病、十字花科蔬菜根肿病、菜叶蜂偶有发生;棕榈蓟马、烟粉虱、番茄细菌性斑点病新发生。病虫周年都有发生,如春季保护地4～5月、露地5～6月;秋季保
At present, the annual planting area of major vegetables in the country is 270 million mu, of which the pest occurrence area is about 350 million mu. According to the result of local measurement and reporting, the report office of National Agricultural Technology Extension Service Center pointed out that in recent years pests and diseases have the following characteristics: new pests and diseases, increased secondary pests and diseases, soil-borne diseases and increased underground pests, which have seriously affected the safety of vegetables. According to the survey, the occurrence of vegetable root-knot nematodes in the protected areas of Beijing is increasingly common and the damage is aggravated; tomato canker disease, cucumber scab, cucurbitaceous cruciferous vegetables and occasional leaf bee; Thrips palmi, Louse, tomato bacterial speckle new occurrence. Pests and diseases have occurred anniversary, such as the spring in April to May, 5 to 6 months in the open; autumn