1. Departamento de Producción Vegetal Est. Exp. “Dr. Mario A. Cassinoni” Facultad de Agronomía Universidad de la República Ruta 3 Km.373 Paysandú 60000 Uruguay
2. U.S. Department of Agriculture Agricultural Research Service Washington State University Pullman WA 99164‐6430 USA
3. Department of Crop and Soil Science Oregon State University Corvallis OR 97331‐3002 USA
4. Department of Botany and Plant Pathology Oregon State University Corvallis OR 97331 USA
5. Instituto de Fitosanidad Colegio de Postgraduados Chapingo Mexico
6. ICARDA/CIMMYT Apdo. 6‐641 06600 Mexico, DF Mexico