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Letter to the Editor

Estimating Parasitic Fitness: A Reply. J. V. Groth, Associate professor, Department of Plant Pathology, University of Minnesota, St. Paul 55108; J. A. Barrett, research associate, Department of Genetics, University of Cambridge, Downing Street, Cambridge, England. Phytopathology 70:840. Accepted for publication 6 May 1980. Copyright The American Phytopathological Society. DOI: 10.1094/Phyto-70-840.