闽北山区稻瘟病菌生理小种消长规律及其应用研究

Studies on Growth and Decline Pattern of Physiological Races of Rice Blast in Mountian Area of North Fujian and its Utilization

稻瘟病是闽北山区水稻的主要病害，１２年来对生理小种消长规律的监测，明确它有相对稳定性和适应性的变异，并明确它与当家品种的推广年限和种植面积密切相关。这些结果对抗源筛选、抗病育种以及品种合理布局、更新轮换、稻瘟病测报和防治等都有重要的意义。

Rice blast, Caused by pyricularia oryzae,is one of the main diseases in northern moun-tain area in Fujian. In the past 12 years,the evolution in prevalence of physiological races have been monitored and the results clearly indicated that the races of blast fungus is rather variable in their stability and adaptability. The variability is closely correlated with the extension period and grow-ing density of popularized rice varieties. These results possess an important significance to screen resistant parent materials, breed resistant varieties, arrange and renew varieties,forcast and pro-tect rice plants from blast diseases.