白粉病是京郊保护地黄瓜的一种重要病害,为害严重。过去主要用托布津防治,由于已连续使用十年,产生了抗药性,效果越来越差。去年,我们用浓度800倍的托布津进行试验,防效只有18.22％。今年5月,我们进行新农药粉锈宁防治黄瓜试验,取得了令人满意的效果。 Powdery mildew is an important disease of cucumber in the protected area of ​​Beijing suburbs, causing serious damage. In the past mainly Tuobujin prevention and control, as has been continuously used for ten years, had a resistance, the effect is getting worse. Last year, we tested with Topaz at a concentration of 800 times, with a control effect of only 18.22%. In May this year, we conducted a trial of new pesticide triadimefon against cucumber and achieved satisfactory results.