STUDIES ON FUSARIUM WILT OF BANANAS: IV. CLONAL DIFFERENTIATION AMONG WILD TYPE ISOLATES OF F. OXYSPORUM f. CUBENSE

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Abstract
F. oxysporum f. cubense exists in diseased rhizomes and pseudostems of Gros Michel bananas in two major clonal groups or cultivars designated 'Odoratum' and 'Inodoratum' because of the presence or absence of a pronounced distinctive odor from cultures after 4 to 8 days on various media. Three clones of the 'Inodoratum' cultivar, difficult to distinguish morphologically on peptone dextrose agar, were distinguishable by cultural interaction and pathogenicity tests in the field. Some clones of the 'Inodoratum' and 'Odoratum' cultivars were shown to differ quantitatively in pathogenicity in the field. Clone C from Honduras, which is limited in distribution, induced the most rapid disease spread and destruction of banana mats, followed by clone E from Panama. There was an association between the 'Inodoratum'and 'Odoratum' cultivars and the syndromes induced in Honduras. The former usually induced strong yellowing of erect leaves whereas the latter usually induced leaf collapse at the petiole with little or no leaf yellowing.

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