Evaluation of the efficacy of some biological factors in suppressing Rhizoctonia solani root rot disease on broad Beans caused by the fungus Rhizoctonia solani

This study was conducted to evaluate the efficacy of some types of biological and chemical agent, individually or in combination with each other, in reducing Rhizoctonia root rot disease on the bean, caused by the fungus Rhizoctonia solani. The laboratory results showed the efficiency of Pseudomonas fluorescens bacteria in inhibiting the fungus Rhizoctonia solani in the culture medium, and the results of the pot experiment showed the efficiency of all bio and chemical treatments, whether alone or with their interactions, in reducing the severity of infection with the fungus Rhizoctonia solani, where the lowest infection severity was recorded in the treatment of the interaction Humic + bacteria + Gibberellin + pesticide for the Shabella variety amounted to 18.33%. It also reduced the negative effect of the pathogenic fungus on the seeds, thus increasing the percentage of germination, as the highest percentage in the treatment of Humic + Bacteria + Gibberellin + pesticide for the local variety amounted to 97.33%. The treatments also led to a rise in the indicators of systemic resistance of the plant. Compared with the healthy control treatment, which included the activity of peroxidase enzyme.