Plant Introductions and Quarantine: The Need for Both. Howard E. Waterworth, Agricultural Research Service, U. S. Department of Agriculture, Beltsville, MD. George A. White, Agricultural Research Service, U. S. Department of Agriculture, Beltsville, MD. Plant Dis. 66:87. 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, 1982. DOI: 10.1094/PD-66-87.