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Effect of F. oxysporum strain Fo47 on incidence of disease caused by P. ultimum. (A) In the absence of Fo47 preinoculation, cucumber seedlings infected with P. ultimum exhibit typical root symptoms, as well as leaf wilting. (B) Plants treated with Fo47 prior to Pythium inoculation have a more vigorous root system, on which only a few tiny lesions (arrow) are detectable.
