黄瓜霜霉病是黄瓜上的毁灭性病害。过去用波尔多液、代森锌等保护性杀菌剂来防治, 喷药次数多,消耗大量人力物力,在黄瓜霜霉病大发生年份,难以控制其危害。七十年代初期出现的多菌灵、托布津等内吸杀菌剂,对藻菌纲所引起的病害均无疗效。据报道在七十年代后期,研制的甲霜灵和乙磷铝,对藻菌纲所致病害具有特效。为了进一步明确对黄瓜霜霉 Cucumber downy mildew is a devastating disease on cucumber. In the past, Bordeaux mixture, dexmedetomidine and other protective fungicides to prevent and control, spraying many times, consuming a lot of manpower and resources, in cucumber downy mildew year, it is difficult to control its harm. Carbendazim, Topuzine and other systemic fungicides that appeared in the early seventies had no effect on the diseases caused by Algae. It was reported that metalaxyl and cefotaxime, developed in the late seventies, had specific effects on diseases caused by Algae. In order to further clarify the cucumber downy mildew