几种杀菌剂防治黄瓜白粉病的田间药效试验

通过田间药效试验，比较了3种杀菌剂对黄瓜白粉病的防治效果。试验结果表明，30%醚菌酯悬浮剂、60%醚菌酯水分散粒剂和3亿cfu/g哈茨木霉菌可湿性粉剂对黄瓜白粉病防治效果良好，连续2次用药，可大幅提高防效。第1次用药后7天，30%醚菌酯悬浮剂1000倍液的防效为70.34%，3亿cfu/g哈茨木霉菌可湿性粉剂各处理的速效性较好，防效整体略优于60%醚菌酯水分散粒剂，其250倍液防效最高，达到79.98%；第2次用药后7天，各处理的防效普遍达到85%以上，其中，60%醚菌酯水分散粒剂2000倍液和3亿cfu/g哈茨木霉菌可湿性粉剂180倍液的防效分别高达96.37%和97.10%。田间应用时，推荐哈茨木霉菌和其他药剂交替使用。

Field Efficacy Trial of Different Fungicides on Controlling Powdery Mildew of Cucumber

In order to determine the control efficacy, field trials were carried of with kresoxim-methyl 30% suspension coneentrate（SC）, kresoxim-methyl 60% water dispersible granule（WDG） and Trichoderma harzianum 3 billion efu/g wettable powder（WP） to control powdery mildew of cucumber. The results showed that, all fungicides had excellent control efficacy, and two successive fungicide applications enhanced the control efficacy significantly. The control efficacy of kresoxim-methyl 30% 5C 1000 times liquid was 70.34% on 7 days after the 1st spraying, and the treatments of Trichoderma harzianum 3 billion cfu/g WP had a certain rapid action, meanwhile, slightly better than kresoxim-methyl 60% WDG on control efficacy, the control efficacy of 250 times liquid reached to 79.98%. Most control efficacy were higher than 85% in 7 days after the 2nd spraying, two of these, kresoxim-methyl 60% WDG 2000 times liquid and Trichoderma harzianum 3 billion efu/g WP 180 times liquid, up to 96.37% and 97.10% respectively. Therefore, it was recommendthat alternate use of the Trichoderma harzianum and others in the field application.