Abstract:

In order to clarify the resistance spectrum of different rice varieties to bacterial leaf blight (BLB), promote direct utilization of resistant varieties, 9 Xoo race representative strains were selected to identify the resistance of 267 rice varieties against bacterial blight by clipping inoculation in 2008 and 2009, which were currently in use or will released in the near future in Yunnan Province, Guizhou Province and Sichuan Province. C5, C7, C8, C9 are the Xoo dominant races in the Southwest of China, only rice varieties in Yunnan Province were resistant to C8 strain of race, accounting for 10.11% of the all tested varieties. By analyzing pathogenicity of the different Xoo races indicated that the C8 was the strongest virulence Xoo, the average length of the disease spot was 23.7±8.3 cm .The results also indicated that high quality rice cultivars such as Hongyou series and ‘Diantun502’ etc showed BB resistance against almost the Southwest dominant Xoo races.