南充市水稻稻瘟病综合防控技术探讨

St udy on the Comprehensive Prevention and Control Technology of Rice Blast in Nanchong Area

南充市水稻生产常发稻瘟病,是四川省稻瘟病重发区之一。鉴于此,从1997年开始,笔者对南充市水稻稻瘟病综合防控技术进行了18年的研究与应用,取得了显著成效。结果表明,不同生产用品种抗瘟性差异明显,杂交稻与糯稻间栽对叶瘟的控制效果杂交稻为45.23%~69.85%、糯稻为61.69%~75.14%,对穗颈瘟的控制效果杂交稻为46.03%~62.41%,糯稻为65.58%~74.82%;搞好病稻草处理和播栽前越冬菌源处理会使稻瘟病发生时间推迟;实施健身栽培的水稻稻瘟病发生程度比采用一般栽培或氮肥偏多的处理轻10.0%~30.0%。并确定了稻瘟病适宜防治药剂和最佳防治时期。

Nanchong city is one of the frequent and serious areas of rice blast in Sichuan Province. Comprehensive prevention and control technology of rice blast were studied and applied since 1997, and made significant achievements. The results showed that dif- ferent varieties have different resistance to rice blast. The control effect of hybrid rice and glutinous rice intercropping to hybrid rice leaf blast were 45.23%~69.85%, to glutinous rice leaf blast were 61.69%~75.14%45%, to hybrid rice panicle blast were 46.03%~ 62.41%, to glutinous rice panicle blast were 65.58%~74.82%. Do a good job of infected rice straw and overwintering pathogen source treatment before sowing and transplanting would postpone the occurrence of rice blast. The occurrence degree of rice blast in health cultivation treatment was lighter 10%~30% than conventional cultivation or excessive application of nitrogen fertilizer treatment. The suitable agents and best control period were determined.