不同化学药剂对水稻叶瘟的田间防效

Control Effects of Several Fungicides Against Rice Leaf Blast

为筛选防治水稻叶瘟的高效药剂,选用7种常用药剂进行了田间试验。结果表明：7种药剂在推荐剂量下施用1次,药后8 d,32.5%苯甲·嘧菌酯悬浮剂防效为70.6%,速效性较好。药后16d,30%三环·氟环唑悬浮剂防效为71.7%,高于其他药剂,持效性较好;32.5%苯甲·嘧菌酯悬浮剂、75%戊唑·嘧菌酯水分散粒剂、75%肟菌·戊唑醇水分散粒剂以及20%三环唑可湿性粉剂防效相当,在57.7%～66.4%之间;40%氟环·稻瘟灵悬浮剂、42%咪鲜·甲硫灵可湿性粉剂防效较差。

In order to screen effective fungicides for controlling rice leaf blast, field trials were carried out with seven fungicides. The results showed that at the recommended doses, the control effect of difenoconazole ＋ azoxystrobin 32.5% SC was 70.6% on the 8th day after spraying. On the 16th day after spraying, the control effect of tricyclazole ＋ epoxiconazole 30% SC was the best. The control effects of difenoconazole ＋ azoxystrobin 32.5% SC, tebuconazole ＋ azoxystrobin 75% WG, tricyclazole 20% WP, and trifloxystrobin ＋ tebuconazole 75% WG had no significant differences.