32.5%苯甲·嘧菌酯悬浮剂防治水稻纹枯病效果及应用技术(英文)

目的]探讨32.5%苯甲·嘧菌酯悬浮剂防治水稻纹枯病效果及应用技术。方法]共调查3次,具体方法为每小区定点5丛,分别记录总株数、病株数和病级数(以后同点考查病情),按病指增长率计算校正防效,并用新复极差法(DMRT)进行差异显著性分析。结果]32.5%苯甲·嘧菌酯悬浮剂对水稻纹枯病有很好的防治效果,其药效随用药量加大而提高,其中450 ml/hm2在水稻破口前5 d喷施对纹枯病的控制效果理想(校正防效达95.14%),仅比对照药剂75%肟菌·戊唑醇水分散粒剂225 g/hm2的校正防效高2.06个百分点。结论]32.5%苯甲·嘧菌酯悬浮剂450ml/hm2处理后,水稻上面叶片青秀、中下部植株黄叶少,增产显著,且安全性较好,因此在生产上具有良好的推广应用前景。

Efficacy of Difenoconazole-azoxystrobin 32.5% SC in Treatment of Rice Sheath Blight and Its Application Technology

Objective] The efficacy of difenoconazole-azoxystrobin 32.5% SC for rice sheath blight and its application technology were discussed in this research. Method] Three surveys were carried out. There were 5 fixed test clumps in each plot. The number of total plants and disease plants and disease progression in each fixed clump were recorded. The correlation effectiveness was calculated based on the growth rate of disease index. Significance analysis was performed with Dun- can＇s new multiple range method （DMRT）. Result] The difenoconazole-azoxystrobin 32.5% SC had a good efficacy for rice sheath blight, and its efficacy increased with the increase of dose. If sprayed according to the dose of 450 ml/hm2 5 days before the beginning of heading stage of rice, difenoconazole-azoxystrobin 32.5% SC would have better effects on controlling rice sheath blight with correlation effectiveness reaching up to 95.14%, which was 2.06% higher than that of control drug （trifloxys- trobin-tebuconazole 75% WG, 225 g/hm2）. Conclusion] Treated with difenoconazole- azoxystrobin 32.5% SC with dose of 450 ml/hm2, rice would have green upper leaves and less yellow middle and lower leaves. Moreover, the yield was in- creased significantly. The difenoconazole-azoxystrobin 32.5% SC had good safety. Therefore, difenoconazole-azoxystrobin 32.5% SC had a good application prospect in production.