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白菜霜霉病是贵州省白菜生产上的主要病害。在春、夏、秋雨季迅速蔓延，造成大面积叶片枯黄，减产２０％～４５％，有的甚至绝收，特别给夏季白菜生产带来严重困难。近年来，防治霜霉病的药剂品种较多，且同一药剂的不同喷药方式、施药时间与防效的关系如何有待于进一步试...
Cabbage downy mildew is the main disease of cabbage production in Guizhou Province. In the spring, summer and autumn, the rapid spread of the rainy season, resulting in a large area of yellow leaves, cut 20% to 45%, and some even absolutely closed, especially for summer cabbage production brought serious difficulties. In recent years, prevention and treatment of downy mildew drug varieties more, and the same agent different spraying methods, spraying time and effectiveness of the relationship how to be further tested ...