Fusarium oxysporum f.sp. cucurbitacearum n.f. embracing all formae speciales of F. oxysporum attacking Cucurbitaceous crops

Fusarium oxysporum f.sp. cucurbitacearum n.f. embracing all formae speciales of F. oxysporum attacking Cucurbitaceous crops

1988

REP.CU-0002

Isolates of Fusarium ox)'sporum from wilted muskmelons. watermelons, cucumbers and from the muskmelon rootstock Benincasa hlspida were screened for pathogenicity on seedlings and adult plants of these crops and related species. In seedling tests the isolates were not typically species-specific. contrary to what might be expected as an implication of their characterization as forma specialis. They often attacked species of several genera of plants. but not beyond the family of the Cucurbitaceae. In the adult stage, plants were much more exclusively attacked by their corresponding formae speciales,. but essential exceptions occurred. Isolates from cucumber were highly pathogenic to muskmelons, in the adult stage even causing more wilt of the latter than of cucumber. Comparing the results of these experiments with data from the literature. it is argued that the proposed f.sp. cucurbitacearum. embracing all formae speciales which specialize on plants within the family of the Cucurbitaceae, would best fit in with the present state of knowledge. A proposition is given for equivalence of old and new classifications of isolates.

no.94(1):17-31, NETHERLANDS JOURNAL OF PLANT PATHOLOGY

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