根据蔬菜栽培的环境条件，正确选用农药和施用方法，是有效地控制病虫危害和预防蔬菜产生药害的一个重要问题。在五十年代加温温室黄瓜生长期间，京郊菜农用雄黄熏蒸防治白粉病，效果良好。经植保工作者总结、编写入书（文），一直被引用至今，所介绍的使用方法为，塑料棚、温? According to the environmental conditions of vegetable cultivation, the correct choice of pesticides and application methods is an important issue to effectively control pests and diseases and prevent vegetables from causing phytotoxicity. In the 1950s, when the greenhouse cucumber was heated, the vegetables in the suburbs of Beijing were used to control powdery mildew and the effect was good. The plant protection workers, compiled into the book (text), has been quoted so far, the use of the method described as a plastic shed, warm?