The Threat of Exotic Plant Pathogens to Agriculture in the United States. C. H. Kingsolver, Pennsylvania State University, University Park. J. Stanley Melching and K. R. Bromfield, Plant Disease Research Laboratory, USDA-ARS, Frederick, MD. Plant Dis. 67:595. This article is in the public domain and not copyrightable. It may be freely reprinted with customary crediting of the source. The American Phytopathological Society, 1983. DOI: 10.1094/PD-67-595.