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Arbogast, M., M.L. Powelson, M.R. Cappaert, and L.S. Watrud. 1999. Response of six potato cultivars to amount of applied water and Verticillium dahliae. Phytopathology. 89(9):782-788. NHEERL-COR-2267J.

Six potato cultivars were grown with or without the addition of Verticillium dahliae inoculum and were watered at 50, 75, 100% estimated consumptive use. The applied water x cultivar interaction was significant (P = 0.009 and P = 0.001 for 1996 and 1997, respectively) . In V.dahliae-infested plots, ‘Katahdin’ and ‘Ranger Russet’ were resistant to Verticillium wilt. Population size of V dahliae in stem apices was significantly lower in ‘Katahdin’ in both 1996 and 1997 (P = 0.0001) and in ‘Ranger Russet’ in 1997 (P = 0.0001) than in other cultivars. ‘Russet Burbank’ and ‘Sheppody’ had large apical stem populations of V.dahliae and higher RAUSPC values associated with both V dahliae inoculum and decreased amount of applied water. Marketable tuber yield was unaffected by V. dahliae in both years. Cultivar resistance to Verticullium wilt was related to cultivar tolerance to moisture deficit stress. Results suggest that moisture deficit stress response has the potential to be a useful tool in protocols for screening potato for Verticillium resistance.

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