Fungicide Resistance: A Continuing Challenge. T. Staub, Agricultural Division, Ciba-Geigy Ltd., Basel, Switzerland. D. Sozzi, Agricultural Division, Ciba-Geigy Ltd., Basel, Switzerland. Plant Dis. 68:1026. Copyright 1984 The American Phytopathological Society. DOI: 10.1094/PD-68-1026.