Thirty-nine isolates of Fusarium oxysporu encompassing five formae speciales causing vascular wilt in cucurbits were examined for genetic similarity by restriction fragment length polymorphisms (RFLP) analysis of mitochondrial DNA (mtDNA). Total DNA was digested with three enzymes (PstI, HindtII, and EcoRI), Southern blotted, and hybridized with a F. o. niveum mtDNA polyprobe (pFON2a-pFON8b). The presence or absence of mtDNA fragments was examined by the unweighted-pairedgroup method using averages (UPGMA) and parsimony analysis. A total of 14 mtDNA RFLP groups were detected []
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D. H. Kim (1993) studied this question.