1. Department of Crop Science, Universidade Estadual de Londrina (UEL), Londrina, Paraná State, Brazil
2. Department of Nematology, EPAMIG, Uberaba, Minas Gerais State, Brazil
3. Department of Phitopatology, Embrapa Soja, Londrina, ParanáState, Brazil
4. Department of Plant Mineral Nutrition, Embrapa Soja, Londrina, Paraná State, Brazil