Performance of biological seed treatment to control soilborne diseases and seedborne fungi of bean, Phaseolus vulgaris
2005
Ghunaim, Magdi E. | El-Zefzaf, Hatem M.
Twelve genera of fungi were found to be associated with bean seed samples, collected from Ismailia and Sharkyia governorates. Nine of these fungi belong to seven genera, which, were previously reported as pathogenic fungi. Rhizoctonia solani and Macrophomina phaseolina gave the highest incidence on the tested seed samples. In pathogenicity trials, these two fungi were also the most aggressive, since they caused the highest occurrence of damping-off on bean seedlings. Positive efficacy of treating bean seeds with either of Bacillus subtilis and Trichoderma harzianum in controlling damping-off and root rot diseases was clearly evident under greenhouse (soil artificially infested with each of R. solani and M. phaseolina) and field conditions (soil naturally infested with soilborne pathogenic fungi). In most cases, B. subtilis was the most effective bioagents against the diseases studied. Moreover, occurrence of the pathogenic fungi on seed yield w as greatly reduced by treating seeds with each of the bioagents before planting
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