Fusarium oxysporumf. sp.pisi,Race 6: Occurrence and Distribution

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Abstract
A new race of F. oxysporum f. sp. pisi was isolated repeatedly from commercial pea[Pisum sativum]-growing areas in western Washington [USA]. This race was 1st observed in 1971 and by 1977 had been recovered from 175 of 640 fields examined. This pathogen was detected either in fields previously free of visible wilt symptoms or in fields with a low incidence of race 2. The symptoms and cultural morphology of the pathogen are identical to those of races 1 and 5. Race 6 can be distinguished from races 1, 2 and 5 by the reaction of 6 differential cultivars including New Season, WSU 23 and WSU 28. This pathogen meets all requirements of being classified as a new race of pea wilt in that it is widespread, host resistance is inherited by a single dominant gene, and pathogenicity tests using differential cultivars with single gene markers for resistance or susceptibility to races 1, 2, and 5 are identical with field reactions. It is proposed that this new strain be designated race 6.

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