Analysis on the Physiological Race Composition of Rice Blast Fungus in Luzhou and Qianjiang Rice Region
Based on the identification of 7 rice blast fungus varieties,99 races in 7 groups were identified, among which group ZB were the predominant populations with the occurrence frequencies in Luzhou area and Qianjiang rice region being 67.42% and 66.50% respectively.
Abstract
Samples of rice blast fungus were collected from different rice varieties in Luzhou area and Qianjiang rice region in 1996～2000 and 646 strains of single conidium were isolated.Based on the identification of 7 rice blast fungus varieties,99 races in 7 groups were identified,among which group ZB were the predominant populations with the occurrence frequencies in Luzhou area and Qianjiang rice region being 67.42% and 66.50% respectively.The subordinate populations were different and the important races of 2 rice areas existed difference.Group ZB from 53,38 uarieties that were detected in Luzhou area and Qianjiang rice region were 92.40%,86.84% in all races respectively.