30%烯唑·咪鲜胺悬浮剂防治稻曲病最佳时期的研究

Studies on Optimum Application Period for Controlling Rice False Smut by 30% Diniconazole and Prochloraz SC

[目的]筛选30%烯唑·咪鲜胺悬浮剂防治稻曲病的最佳适期。[方法]分别于水稻剑叶露尖期、剑叶耳始见时、上两叶耳距2～3cm时、孕穗期、破口期、抽穗期、齐穗-扬花期按750g/hm^2喷施30%烯唑·咪鲜胺悬浮剂,统计防治效果,筛选稻曲病的防治适期。[结果]30%烯唑·咪鲜胺悬浮剂在水稻不同生长期喷施,对稻曲病的防治效果有明显差异。以剑叶露尖期施药防治效果最低,不到20.00%;以剑叶耳始见时施药防治效果最高,达77.06%;上两叶耳距2～3cm时、孕穗期、破口期、抽穗期、齐穗-扬花期的防治效果依次降低。[结论]剑叶耳始见时施药对稻曲病的防治效果最好。

[Objective] The study aimed to screen the optimum application period for controlling rice false smut by 30% Diniconazole and Prochloraz SC. [ Method] The optimum application period were screened by comparing the controlling effects of 30% Diniconazole and Prochloraz SC 750 g/hm^2 on rice false smut in different growth periods, including flag leaf tip appearing stage, flag leaf auricle extending stage, stage when the distance between the leaf auricles of upper two leaves was 2 - 3 cm, booting stage, rupturing stage, heading stage, full heading and flowering stage. [ Result ] There were significant differences for the controlling effects of 30% Diniconazole and Prochloraz SC on Rice False Smut applying in different growth periods. The controlling effect of applying the fungicide in flag leaf tip appearing stage was lowest, not up to 20.00%, that in flag leaf auricle extending stage was highest, up to 77.06%, and the that in stage when the distance between the leaf auricles of upper two leaves was 2 - 3 cm, booting stage, rupturing stage, heading stage, full heading and flowering stage were decreased orderly. [ Conclusion] The controlling effect of applying the fungicide on rice false smut in the flagleaf extending stage was best.