Fusarium foot rot of sweet-potato sprouts

Fusarium foot rot of sweet-potato sprouts

1951

A:PS

Certain single-spore cultures of Fusarium solani, isolated from rotted sweet potatoes, were found to be mildly pathogenic to sweet-potato sprouts, causing a limited black foot rot. The infection did not progress above te basal node, nor were roots rotted for more than 1 cm. The pathogen was found to be a wound parasite incapable of attacking uninjured stems or roots. Freshly cut sprouts inoculated with this foot-rot Fusarium were protected from subsequent infection by the sweet-otato wilt fungus, Fusarium oxysporum f. batatas. This protection occurred when as short a time as 1 day or less elapsed between inoculations. Tyloses were abundant in the xylem in advance of the foot-rot pathogen. Other isolates of Fusarium solani, culturally similar to the foot-rot Fusarium, were nonpathogenic to freshly cut sprouts and incapable of protecting sprouts from subsequent infection with the wilt Fusarium. Pathogenesis for sweet potato in Fusarium solani has been denoted by creation of a new form, F. solani f. batatas, and the disease produced has been named the Fusarium foot rot of sweet potatoes. [AS]

v.41(1):72-77, PHYTOPATHOLOGY

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