Independent Segregation in Potato for Resistance to Verticillium Wilt and Pink-Eye. R. W. GOTH, Research Pathologist, USDA-ARS, Vegetable Laboratory, Beltsville, MD 20705. K. G. HAYNES, Research Geneticist, USDA-ARS, Vegetable Laboratory, Beltsville, MD 20705, and D. R. WILSON, Horticulturist, USDA-ARS, Vegetable Laboratory, Presque Isle, ME 04769. Plant Dis. 78:562-564. Accepted for publication 8 February 1994. 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, 1994. DOI: 10.1094/PD-78-0562.

In 1991 and 1992, 30 potato families (comprising approximately 1,3.10 genotypes) were evaluated for resistance to both Verticillium wilt, caused by V. albo-atrum and V. dahliae, and pinkeye, a disease of unknown etiology. Significant differences were found among families for severity of Verticillium wilt and incidence of pink-eye. Within-family variability accounted for more than 90% of the observed variation for both traits in both years. Homogeneous variances for severity of Verticillium wilt across families were observed in both years; in contrast, heterogeneous variances for incidence of pink-eye across families were observed in both years, with greater variance in those families with a higher incidence of pink-eye. In general, there was no consistent relationship between severity of Verticillium wilt and incidence of pink-eye in segregating families.

Keyword(s): Solanum tuberosum