Prevalence of Verticillium Wilt of Tomato and Virulence ofVerticillium dahliaeRace 1 and Race 2 Isolates in Western North Carolina

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Abstract
Verticillium wilt was confirmed in 56% of 108 tomato fields surveyed (56.5% of 65.6 ha) in western North Carolina in 1976. Estimated disease incidence in the surveyed region was 9.2%. Of 96 V. dahliae, 89 isolates recovered from susceptible cultivars in the survey were race 1: seven were race 2. Six race 2 isolates came form fields not previously cropped with race 1-resistant cultivars. In field tests, mean yields were reduced in susceptible cv. Manapal and Walter and race 1-resistant cv. Flora-Dade and Monte Carlo, respectively, by as much as 39.9, 47.1, 3.5, and 6.5% by race 1 isolates and 10.3, 31.2, 19.3, and 22.8% by race 2 isolates.