A Reappraisal of the Race Classification of Fusarium oxysporum f. sp. pisi

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Abstract
Data collected independently at Mt. Vernon and Prosser, Washington [USA] suggested a reappraisal of the recently published race classification scheme for F. oxysporum f. sp. pisi wherein 11 races of the fungus were defined. The 11-race classification is based more on virulence differences than on true genetic differences in the host [pea], and these same 11 races should be grouped into either race 1 or race 2 types. To minimize the possibility of cultural variants being classified as new races of F. oxysporum f. sp. pisi, the following criteria are suggested: the isolate must be associated with a prevalent wilt disease under field conditions; the isolate can be distinguished from other known races of F. oxysporum f. sp. pisi by a known gene difference in the host.

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