Populations of Xanthomonas campestris pv. vesicatoria were monitored over four seasons on leaves of two tomato cultivars and five genotypes selected for various levels of resistance to the pathogen. Populations on all five genotypes were consitently below those on the very susceptible Lyconorma, but only those on Hawaii 7998 were significantly below numbers of the susceptible cultivar Walter in every test. Rankings of cutigens based on support of epiphytic populations of X. c. pv. vesicatoria mirrored those based on defoliation over two seasons (...)
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Raymond G. McGuire (1991) studied this question.