A Biologically Oriented Threshold Decision Model for Control of Eflemics of Septoria nodorum in Wheat. J. A. Verreet, Technical University of Munich, Freising-Weihenstephan, Germany. G. M. Hoffmann Technical University of Munich, Freising-Weihenstephan, Germany. Plant Dis. 74:731-738. Copyright 1990 The American Phytopathological Society. DOI: 10.1094/PD-74-0731.