Abstract
Field observations of reduced incidence and severity of Botrytis fabae infection of field bean, on plots previously inoculated with Ascochyta fabae , prompted an investigation into possible antagonism between the two fungal pathogens. The spread of B. fabae lesions was significantly retarded on detached bean leaves pre-inoculated with A. fabae . The latter showed antifungal activity in vitro against B. fabae and a clear zone of inhibition was produced on several different agar media. The antagonism between A. fabae and B. fabae, in vitro and on detached leaves, was possibly caused by the production of the toxin ascochitine by A. fabae . Also, the capacity of B. fabae to metabolize phytoalexins may be changed when tissues are pre-inoculated with A. fabae , which may reduce the pathogenicity of the former organism.
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