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Long term effect of applied compost and bio-agents as integrated treatment for controlling bean root rot disease in solarized soil under field conditions

Management of Bean (Phaseolus vulgarus L.) root rot disease caused by Fusarium solani and Rhizoctonia solani was investigated. Efficacy of T. harzianum and P. fluorescens alone or in combination with compost for controlling bean root rot disease in solarized or un-solarized soil under field conditions were studied. In vitro the highest reduction was obtained with P. fluorescens and T. harzianum which reduced the growth area more than 90.6 and 87.4 % for F. solani and R. solani respectively. Under field conditions, the average maximum of soil temperatures in solarized soil was increased by 15.0, 14.3 and 13.1 o C at depths of 10, 20 and 30cm of soil surface as compared with un-solarized soil. The pronounced applied treatments throughout two successive growing seasons were compost A (animal waste) combined with T. harzianum or P. fluorescens, followed by compost P (agriculture waste) combined with the same bioagents in solarized soil which they reduced the root rot disease at pre-, and post-emergence growth stages, respectively. As for bean yield the highest increase was obtained at combined treatments of compost A and T. harzianum or P. fluorescens, followed by combined treatments between compost P and T. harzianum or P. fluorescens in solarized soil. Referring to the obtained results in the present study, it could be suggested that combined treatment between compost and bioagents as safety method might be used commercially for controlling bean root rot disease under field conditions.