葱类霜霉病的防治建水县农广校６５４３００王家田葱类霜霉病在我省各地均有发生。近年来发生越来越严重，对葱类产量和质量影响较大，这一病害主要是借风、雨、昆虫等传播为害，一般在地势低洼、排水不良、低温高湿的条件下易发生。受害部位初生卵圆形或长条形斑点，黄色... Onion class downy mildew prevention and control Jianshui County Agricultural Broadcasting University 654300 Wang Jiatian onion downy mildew occurred throughout the province. Occurred in recent years, more and more serious on the yield and quality of onion greater, the disease is mainly by the wind, rain, insects and other transmission damage, generally low lying, poor drainage, low temperature and humidity conditions prone. Injured parts of primary oval or strip-shaped spots, yellow ...