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[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。
[Objective] The research aimed to discuss the effect and application technology of 32.5% azoxystrobin as a suspending agent in controlling rice sheath blight. [Methods] A total of 3 surveys were carried out. The specific method was to designate 5 plexuses in each plot, record the total number of plants, the number of diseased plants and the number of disease stages (later test the same condition), calculate the corrective control effect according to the rate of disease increase, Method (DMRT) significant difference analysis. [Result] The results showed that 32.5% azoxystrobin suspension had a good control effect on rice sheath blight. Its efficacy increased with the increasing dosage, of which 450 ml / hm2 was sprayed 5 days before rice blast opening The control effect on sheath blight was good (correction effect reached 95.14%), which was only 2.06% higher than that of 225 g / hm2 of 75% oxime and tebuconazole water dispersible granules. [Conclusion] After treatment with 450 mg / hm2 of 32.5% azoxystrobin suspension, the leaves on the top of the rice were green, the yellow leaves in the middle and lower parts were small, the yield was significant and the safety was good. Therefore, it had a good popularization and application in production prospect.