1. Luiz de Queiroz College of Agriculture, University of São Paulo, Plant Pathology and Nematology Department, Piracicaba 13418-260, Brazil
2. The Federal University of Mato Grosso, Federal University of Mato Grosso, Postgraduate Program in Agronomy, Sinop, Mato Grosso 78.557-287, Brazil
3. University of Tennessee, Institute of Agriculture, Knoxville, TN, U.S.A.