Abstract
Populations of Fusarium oxysporum were sampled from two agricultural fields in Maryland. Among 197 isolates, 56 vegetative compatibility groups (VCGs) and 25 mitochondrial DNA (mtDNA) haplotypes were identified. Fifty-four VCGs, representing 97% of the VCG diversity and 92% of the mtDNA haplotypes, were found among 78 isolates that were not pathogenic to muskmelon. The remaining two VCGs included 115 isolates of F. o. melonis: 40 isolates in VCG 0131 (races 0, 1, and 2) and 75 in 0134 (races 1 and 1,2). This is the first report from North America of race 1,2, for which there is presently no resistance in muskmelon. The two VCGs associated with virulent isolates also included four nonpathogenic isolates [...]
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