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Crop Protection and Society, a Course at Wageningen Agricultural University. J. C. Zadoks, Department of Phytopathology, Wageningen Agricultural University, P. O. Box 8025, 6700 EE Wageningen, Netherlands. Plant Dis. 73:861. Copyright 1989 American Phytopathological Society. DOI: 10.1094/PD-73-861.