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Simultaneous inoculation with races 1 and 2 of the vascular wilt pathogenFusarium oxysporumf.sp.lycopersiciprovided a high level of protection against race 2 in three tomato cultivars carrying resistance geneI, which confers resistance to race 1 but not race 2. However, simultaneous inoculation did not provide any protection in cultivars lacking this gene. Protection resulted in reduction and delay...