南充市水稻稻瘟病重发成因及治理对策

Occurrence Determinants of Rice Blast in Nanchong and Its Control Measures

为准确掌握稻瘟病在南充的发生规律,科学制订防控措施,1998—2007年对南充市水稻稻瘟病进行了大田普查和系统调查分析,结果表明,水稻品种抗瘟性对稻瘟病发生与否起着决定性作用,本地菌源量多少决定发生流行早迟,适宜气候条件有利于加重流行强度和为害程度,适时防控可减轻稻瘟病为害和流行。通过近年来示范实践,提出了推广农业生态防控、及时监测预报规范防治区域和搞好化学药剂防治等治理对策。

Rice blast in Nanchong has been general and system investigated in 1998-2007 m order to accurately grasp the occurrence of rice blast and scientifically formulate its control measures. The results showed that the occurrence determinants included resistance of rice variety, local pathogen, and weather condition and control level. The resistance of rice variety played a decisive role in whether the rice blasr took place or not. The occurrence time of rice blast depended on the number of local pathogen. The appropriate climate would increase the level of hazard from blast. And the control in appropriate period would decrease the damage degree. In addition, the control measures were put forward in this paper. To develop the agriculture ecological management, to monitor and forecast the disease in time and make the control area norm, to carry out strictly the chemical control were considered the better control measure for rice blat in Nanchong.