Pathotypes and biotypes of Ralstonia solanacearum isolated from bacterial wilt of peanut in Fujian Provinece

The 72 strains of Ralstonia solanacearum were isolated from bacterial wilt plants of peanut collected from 10 counties (or cities) in Fujian and pathotypes of 15 strains and the physiological and biochemical properties 29 were tested. According to their pathogenicity, most of the strains tested belonged to pathotype Ⅶ, a few of them belonged to pathotype Ⅵ. Based on their capacity of utilizing lactose, maltose, cellobiose, mannitol, sorbitol, duleitol and the reduction ability to KNO 3, the strains tested were determined to be biotype Ⅲ, except one isolated from Jingjiang, which could not reduce KNO 3, belonged to biotype Ⅲ 4, still another one, which could not oxidize sugars but alcohols tested, accordingly should be biotype Ⅳ.