Abstract
Rhizoctoniasolani on green beans has been chosen as one of the best pathosytems to evaluate root rot diseases as well as to determine the effectiveness of potential of the biocontrol agent Trichoderma species (ssp.). In this study we investigate the effective use ofthe pathosystem model; Rhizoctoniasolani-green beans to reveal bio control efficacy of three Trichoderma spp.; T. afro-harzianum, T. reesei and T. guizouhense, isolated from Moroccan soils. In greenhouse conditions, root-dipping approach was involved in revealing bio control potential of localTrichoderma spp. by suppressing root diseases in Rhizoctonia-green beans pathosystem. Interestingly, T. reesei (T9i12) a breaking cellulose succeeded in suppressing disease incidence in root units (DI-RU) = 0.0% in green bean cultivars infected with Rhizoctoniasolani.
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