当前,北方保护地蔬菜生产主要以番茄、黄瓜为主,由于常年生产和连作,病害发生十分严重,不仅给生产造成较大经济损失,而且农药投入量逐年增加,药剂残留、抗药性和污染已成为人们生产和生存亟待解决的问题。如何因病制宜地采取有效措施,适时准确用药,科学施用,是降低残留、延缓抗性及减轻污染,生产无公害蔬菜,提高农民经济效益的关键。 一、黄瓜霜霉病 At present, the vegetable production in the northern protected areas mainly consists of tomatoes and cucumbers. Due to perennial production and continuous cropping, the diseases are very serious, which not only causes great economic losses to the production, but also increases the input of pesticides year by year. The residue, drug resistance and pollution have been Become people’s production and survival problems to be solved. How to take effective measures due to disease-specific measures, timely and accurate drug use, scientific application, is to reduce residues, delay the resistance and reduce pollution, pollution-free vegetables, improve the economic efficiency of farmers key. First, cucumber downy mildew