1. Crop Production Graduate Program, Universidade do Estado de Santa Catarina, Av. Luis de Camões, Lages, SC 88520-000, Brazil
2. Proterra Research Center, BR 116, 7320, 95.200-000, Vacaria, RS, Brazil
3. Embrapa Grape and Wine, 95.700-00, Bento Gonçalves, RS, Brazil
4. Department of Plant Pathology, University of Nebraska, Lincoln, NE 68583-0722, USA