Distribution and Virulence Diversity of Phytophthora sojae in China

Abstract

By investigating on occurrence of Phytophthora root rot (PRR) in fields and isolating P. sojae from di-seased plants and soils, the distribution of P. sojae in China was surveyed. In addition to northeast region, P. sojae existed in Huanghe-Huaihe basin and Yangtse basin too. Eighty three isolates of P. sojae isolated from different areas were identified on virulence using 13 differential soybean cultivars, abundant virulence diversity was found in P. sojae. The greater diversity in virulence of P. sojae was in isolates from soil than from plants. And the greatest virulence diversity of P. sojae was found in Yangtse basin.