1. Knorr, L. C. 1944. Unpublished data.
2. Scott, C. E., Kendrick, J. B., Lindsay, M. A., and Ark, P. A. 1941. Progress report on potato ring rot. Univ. Cal. Exten. Service. Unnumbered mimeo. publ., pp. 1–25.
3. Starr, G. H. 1940. Potato ring rot spread and its control by disinfectants. Phytopathology 30: 23.