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Susceptibility of “Resistant” Tomato Cultivars to Fusarium Wilt. John Paul Jones, Agricultural Research and Education Center, Bradenton, Fla. 33505; Pat Crill, Agricultural Research and Education Center, Bradenton, Fla. 33505. Phytopathology 64:1507-1510. Accepted for publication 24 June 1974. DOI: 10.1094/Phyto-64-1507.

Missouri Accession 160 and other tomato lines possessing the 1 gene for resistance to Fusarium wilt incited by race 1 seemed susceptible to race 1 following inoculation via the Wellman root-dip method. University of Florida tomato breeding line 126915-1-8-1, ‘Walter,’ and ‘Florida MH-1’ were resistant to race 1, indicating that these lines possessed a gene (or genes) for resistance the Missouri Accession 160 did not. Approximately 17% of the 1-gene cultivars were less tolerant of race 2 than several race 1-tolerant cultivars. However, the “Vertifolia” effect was shown not to be inevitable, because 21% of the 1-gene varieties were more tolerant of race 2 than the race 1-tolerant varieties.