Control of faba bean root rot disease by using micro-elements and the fungicide, rhizolex-T

Some microelements, namely zinc, manganese and calcium were used singly or in combination with typical fungicide, Rhizolex-T 50 to investigate their effect towards the control of faba bean root-rot caused by Rhizoctonia solani. Laboratory, greenhouse and field studies were conducted during 2008/2009 & 2009/2010 seasons using the faba bean cultivar, Giza 40. Results of in vitro studies showed that microelements or Rhizolex-T significantly inhibited the mycelial growth of the pathogen, R. solani when compared with the untreated control.Under greenhouse conditions, all isolatedfungi proved to be pathogenic and caused preand postemergence damping-off while R. solani being the most virulent. All some microelements or the fungicide tested as seed treatments for field experiments led to an increase in the plant height . Rhizolex-T 50 followed by zinc were the most effective treatments in reducing the incidence of faba bean dampingoff. Calcium followed by zinc were the most effective in increasing the number of pods per plant, the weight of 100 seeds, and seed yield / plot. The most effective seed treatment in reducing the root-rot disease incidence was Rhizolex-T followed by zinc and then calcium.