Screening Tomato Seedlings for Resistance to Verticillium dahliae Races 1 and 2. W. R. Okie, Research Assistant, Department of Horticultural Science, North Carolina State University, Raleigh 27607. R. G. Gardner, Assistant Professor, Department of Horticultural Science, North Carolina State University, Raleigh 27607. Plant Dis. 66:34-37. Accepted for publication 20 April 1981. Copyright 1982 American Phytopathological Society. DOI: 10.1094/PD-66-34.

Tomato (Lycopersicon esculentum) cultivars and breeding lines were screened in the greenhouse for resistance to local isolates of Verticillium dahliae races 1 and 2. Heinz 1350, C28, Morden MEL2668170G, and Morden LAC3684 were most resistant to race 2, although the level of resistance was less than that conferred by the Ve gene against race 1. Italian Winter was highly susceptible to both races. Correlation of parental and F₁-array means of 10 selected lines crossed in a half diallel was highly significant for both races. The F₁ most resistant to race 2 was Morden MEL2668170G × Morden LAC3684. F₁ hybrids heterozygous for the Ve gene were less resistant to race 1 than homozygous F₁ hybrids, suggesting incomplete dominance of the Ve gene.

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