Pathogenicity of Pythium spp. obtained from agricultural soils and symptomatic legume seedlings in Uruguay

Pythium spp. were isolated from symptomatic plants and agricultural soils in Uruguay. Species were identified and the pathogenicity of representative isolates was assessed in vitro on lotus, alfalfa and soybean seeds. Pythium sylvaticum and P paroecandrum were the least virulent on lotus and alfalfa, while P irregulars, P ultimum and P oyptoirregulare were the most virulent. Soybean seeds were equally affected by isolates of all tested Pythium species.