1. Department of Plant Pathology; Federal University of Lavras; Lavras Minas Gerais Brazil
2. Embrapa Semi-árido; Petrolina Pernambuco Brazil
3. Department of Chemistry; Federal University of Lavras; Lavras Minas Gerais Brazil
4. Center of Technology; Fibria Celulose S.A.; Aracruz Espírito Santo Brazil