Management of Damping-Off and Root-Rot Diseases of Faba bean by Bioproducts and Inducer Resistance Chemicals

Abstract

This study was carried out to evaluate the efficiency of Plant Guard (Trichoderma harzianum) and Rhizo-N (Bacillus subtilis) as bioproducts in combination with ascorbic and shikimic acid as inducer resistance chemicals in management of faba bean damping-off and root-rot diseases caused by Fusarium moniliforme, F. solani and Macrphomina phaseolina under greenhouse and field conditions. In vitro using the tested two bioagents as well as the two inducer resistance chemicals (IRCs) and the fungicide Rizolex-T, significantly reduced the linear growth of the tested three pathogenic fungi. Rizolex-T followed by T. harzianum then ascorbic acid were the most effective treatments in reducing the linear growth of the tested fungi. Meanwhile, shikimic acid followed by B. subtilis were the lowest efficient ones in this regard. Under greenhouse conditions, soaking faba bean seeds in ascorbic acid then coating with Plant Guard (after adding talc powder) or Rhizo-N were the most effective treatments in managing the tested fungi. However, dressing faba bean seeds with the fungicide Rizolex-T was the superior treatment in this regard. In field experiments, soaking faba bean seeds in ascorbic or shikimic acid then coating with Plant Guard were the most effective treatments in reducing the natural infection by damping-off and root-rot diseases. Moreover, these treatments improved the estimated crop parameters as well as increased the percentages of total nitrogen and protein constitute of the dry seeds compared with the control treatment. Also, dressing faba bean seeds with the fungicide Rizolex-T was the superior treatment in this respect.