Biological Control of Chestnut Blight: Use and Limitations of Transmissible Hypovirulence. William L. MacDonald, Division of Plant & Soil Sciences, West Virginia University, Morgantown; Dennis W. Fullbright, Department of Botany and Plant Pathology, Michigan State University, East Lansing. Plant Dis. 75:656-661. Copyright 1991 The American Phytopathological Society. DOI: 10.1094/PD-75-0653.