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山东省聊城市近几年蔬菜种植面积逐年扩大,2000年达到200万亩,其中冬季保护地蔬菜面积达到30多万亩。一年四季蔬菜生产不断,也给病虫害的发生危害提供有利条件。如瓜类的霜霉病、蔬菜根腐病、灰霉病、温室白粉虱、茶黄螨、甜菜夜蛾、小菜蛾等已成为常发性病虫害。对蔬菜病虫害的防治采用化防和生物制剂相结合是普遍应用的方法,选择的药剂必须具备高效、低毒、低残留。目前经农业部登记的国产农药虽然有几千个品种,但在蔬菜上达到高效、低残留的品种为数不多,杀虫剂类可选的也只限于 Bt 制剂、阿维菌素、吡虫啉和菊酯类,杀菌剂类多数效
In recent years, the planting area of vegetables in Liaocheng City, Shandong Province has been expanding year by year, reaching 200 million mu in 2000, of which the vegetable area in winter protected areas reached more than 300,000 mu. Continuous vegetable production throughout the year, but also to the occurrence of pests and diseases to provide favorable conditions. Such as melons downy mildew, vegetable root rot, gray mold, greenhouse whitefly, tea yellow mite, beet armyworm, diamondback moth and so has become a common pest. The prevention and treatment of vegetable pests and diseases using a combination of chemical prevention and biological agents is a commonly used method, the choice of agents must have efficient, low toxicity, low residue. Although there are several thousand varieties of domestic pesticides registered by the Ministry of Agriculture, few varieties of high-efficiency and low-residue vegetables are available. The optional pesticides are limited to Bt preparations, abamectin, imidacloprid and Pyrethroids, fungicides mostly effective