杀菌剂防治温室黄瓜白粉病的效果评价

Control Efficacy of Fungicides against Cucumber Powdery Mildem in Facility

黄瓜白粉病是设施黄瓜生产过程中重要的真菌性病害。为了筛选控制黄瓜白粉病的有效药剂,为黄瓜生产提供有力保障,本研究以70%的甲基硫菌灵可湿性粉剂(WP)、50%嘧菌酯水分散粒(WG)、42.8%氟菌·肟菌酯悬浮剂(SC)、20%吡噻菌胺悬浮剂(SC)作为供试药剂,以新泰‘密刺黄瓜’为供试品种,进行黄瓜白粉病的药剂防治试验。结果表明,4种杀菌剂对黄瓜白粉病均有较好的防控效果,且在黄瓜的整个生育期内无不良影响。其中以42.8%氟菌·肟菌酯悬浮剂防治效果最好;施药后7 d和14 d的防效分别为83.92%和75.25%,与其它几个药剂处理存在显著差异。建议在今后黄瓜白粉病的防治过程中,根据发病情况,每7 d施用42.8%氟菌·肟菌酯悬浮剂1次,连续施药2~3次可有效控制黄瓜白粉病。同时,20%吡噻菌胺悬浮剂可作为替换药剂使用,避免白粉病抗药性的产生。

The cucumber powdery mildem is an important fungal disease in cucumber production.In order to select efficient fungicides to control the disease and offer a useful reference in future,this study used 70%thiophanate-methyl(WP),50%kresoxim-methyl(WG),42.8%triflumizole-trifloxystrobin(SC)and 20%penthiopyrad(SC)as the test drugs,and Xintai‘Mici cucumber’as the test variety to conduct a pesticide control experiment on cucumber powdery mildew.The results showed that the four fungicides had the good control efficacy against the cucumber powdery mildem and had no bad effect.The 42.8%triflumizole-trifloxystrobin(SC)was the best fungicide to control the disease.The control efficacy were 83.92%and 75.25%after after 7 days and 14 days of spraying fungicide,there were significant difference among them.It was suggested to spray 2 or 3 times to control the disease and there was a 7 day interval between 2 times in the controlling process,at the same time 20%penthiopyrad(SC)was the alternative agent to use in order to avoid the drug-resistance of the pathogen.