1. Department of Phytopathology and Nematology in Soil Ecosystems; Institute of Crop Science and Resource Conservation; University of Bonn; Nussallee 9 53115 Bonn Germany
2. United States Department of Agriculture-Agricultural Research Service; Water Management Research Unit; 9611 South Riverbend Avenue Parlier CA 93648 USA
3. Department of Plant Production; National University of Agriculture; PO Box 09 Barrio El Espino Catacamas Honduras
4. International Maize and Wheat Improvement Center; PK 39 06511 Ankara Turkey