黄瓜霜霉病菌抗药性的发生及化学防治

由古巴假霜霉引起的黄瓜霜霉病是黄瓜上的毁灭性病害,主要依靠化学防治,但采取将化学防治与预测预报、棚室通风、利用抗病品种、生物防治相结合的综合防治策略和预防性施药措施,可有效减轻黄瓜霜霉病的为害。主要防治药剂有接触性杀菌剂和内吸性杀菌剂,必须交替或混用以延缓抗药性的产生。黄瓜霜霉病菌对苯基酰胺类杀菌剂的抗性普遍发生,在日本检测到对QoI类杀菌剂的田间抗性菌株,必须评估对新型杀菌剂的抗性风险,制订相应的抗药性治理对策,以延长药剂的使用寿命。

Occurrence of Fungicide Resistance and Chemical Control of Cucumber Downy Mildew

Downy mildew caused by Pseudoperonospora cubensis is a destructive disease on cucumber,which mainly relies on chemical control.It could effectively decreased by implementing the integrated prevent strategy with chemical control,prediction and forecast,greenhouse ventilation,resistant varieties and biological control and preventive application of fungicides.The main fungicides consisting of contact fungicides and systemic fungicides should be applied alternatively or mixed with other fungicides of different action mechanism to delay the development of fungicide resistance.P.cubensis resistant to phenylamide fungicides occurred world widely,and strains resistant to QoI fungicides were detected in Japan.The risk of resistance to novel fungicides should be assessed,and the strategies of management of resistance to high-risk fungicides should be implemented to prolong the application years of fungicides.