Stability of Resistance of Potato to Strains of Verticillium dahliae from Different Vegetative Compatibility Groups. D. L. Corsini, Research Plant Pathologist, USDA, ARS, University of Idaho Research and Extension Center, Aberdeen 83210. J. R. Davis, Professor, and J. J. Pavek, Research Geneticist, USDA, ARS, University of Idaho Research and Extension Center, Aberdeen 83210. Plant Dis. 69:980-982. Accepted for publication 15 April 1985. 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, 1985. DOI: 10.1094/PD-69-980.

Potato (Solanum tuberosum) clone A66107-51 was resistant to a range of potato strains of Verticillium dahliae. These included strains from three vegetative compatibility groups, P1, P3, and P4. Resistance was determined by symptom expression and colonization of stems under greenhouse conditions. The wilt-susceptible cultivar Russet Burbank was very susceptible to strains from compatibility group P4, moderately susceptible to a strain from group P3, and not susceptible to a strain from group P1 and an unclassified strain. The Verticillium wilt resistance of clone A66107-51 was not affected by the vegetative compatibility group or geographic origin of V. dahliae strains.