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Resistance of Selected Potato Cultivars and Clones to Fusarium Dry Rot. S. S. Leach, Research plant pathologist, USDA-SEA/AR, University of Maine, Orono 04469; R. E. Webb, research plant pathologist, USDA-SEA/AR, Beltsville, MD 20705. Phytopathology 71:623-629. Accepted for publication 3 November 1980. 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, 1981. DOI: 10.1094/Phyto-71-623.

A total of 13 white potato cultivars plus 247 breeding clones from the USDA Potato Breeding Program were screened for resistance to Fusarium roseum ‘Sambucinum’ from 1973 through 1977. Varying degrees of resistance were observed and one clone, B7200-33, appeared immune. In 1978, 30 clones from the USDA Breeding Program and 93 entries from Sangerville Farm, Maine Department of Agriculture, were screened for resistance to F. roseum ‘Sambucinum’ and F. solani ‘Coeruleum’; only B7200-33 was highly resistant to both Fusarium species. No correlation was found between amount of sprout growth and Fusarium resistance.