1985年在川西北地区29个县的当地32个品种上,采集1233个标样鉴定出川西北地区有6群28个生理小种,其中以B群分布最广,出现频率为74.36％,对汕优2号致病力强。并出现毒力最强的A群小种。防治对策除消灭菌源、改进栽培措施外,要抓好品种合理布局、选用抗病品种如汕优63,但必须注意合理搭配其他抗、耐病良种。药剂防治,采取“普治秧田苗、叶瘟,挑治本田叶瘟,狠治穗颈瘟”的防治策略。 In 1985, 1233 samples were collected from 32 local breeds in 29 counties of northwestern Sichuan and 6 groups of 28 physiological races were identified. Among them, B group was the most widely distributed with the frequency of 74.36% Excellent 2 strong pathogenicity. And the most virulent Group A races appeared. Control measures In addition to eliminating the source of bacteria, improve cultivation measures, we should do a good job of rational distribution of varieties, selection of resistant varieties such as Shanyou 63, but we must pay attention to reasonable with other resistant and resistant varieties. Pharmacy control, take the “general management seedling seedlings, leaf blast, pick and cure Honda leaf blast, ruthless cure panicle blast” prevention and control strategies.