1. Agronomy Dep. Federal Univ. of Viçosa 36570‐900 Viçosa MG Brazil
2. Center for Agricultural Sciences and Technologies State Univ. of North Fluminense Darcy Ribeiro 2000 Alberto Lamego Avenue, Parque Califórnia, 28013‐602 Campos dos Goytacazes RJ Brazil
3. Plant Pathology Dep. Univ. de Brasília (UnB) Brasília DF Brazil