Abstract：
Four hundred eighty one rice blast specimen were collected from 55 varieties planted in 11 counties (or cities or divisions) in Wenzhou rice region during 1991-1993, and 354 single conidia isolates were obtained. The isolates were assessed on 7 Chinese differential varieties, and 7 groups and 23 races were identified. Among them, group ZB was predominant with 80.23% of isolated frequency. The predominant races were ZB1, ZB9 and ZB13. The kinds of races had much changed compared with the general survey during 1981-1984. The races isolated from major varieties cultured in Wenzhou region were analysed. There was specificity in the race-variety interaction, so different races were detected depending on the varieties. The resistance of 11 major varieties to the tested isolates of Wenzhou region was examined. Varieties Shanyou 10 and Fuxin 6 had higher resistance, showing over 76% resistant frequency. Other tested varieties showed low resistant frequency. The resistant frequency of most major varieties to the predominant races was lower than to general isolates. Predominant races ZB1, ZB9 and ZB13 were of strong virulent to the major varieties in this rice region. It was important and urgent that breeding or introducing fine varieties with resistance to group ZB, especially to race ZB1, ZB9 and ZB13.
Du Xinfa,Xu Jing,Lin Zaiqin et al. Race Evolution of Pyricularia grisea and Resistance Analysis of Partial Major Varieties in Wenzhou’s Rice Region[J]. , 1996, 10(2): 110-114 .
1996, Vol. 10 
