Effect of Trichoderma harzianum against Thielaviopsis paradoxa and their pathological potential on date palm seedlings
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Abstract
isolates were varied of antagonistic properities toward T. paradoxa. Trichoderma harzianum (No. 1) was highly suprssed and showed over growth on T.paradoxa , meanwhile T. harzianum (No. 8) reduced linear growth of
T. paradoxa by 44 % and recorded high inhibition zone than the all Tricoderma isolates tested. Germinated seeds of date palm were soaking for 1 hour on T. harzianum isolate (No. 8) before, after and during inoculation by T. paradoxa. Different treatments of soaking date palm seeds on T. harazianum isolate (No.8)showed significantly reduced rot root of date palm seedlings than control. Germinated seeds of date palm were soaked with T. harzianum before inoculation of T. paradoxa gave more effective to reduce root rot of date palm seedlings than treatment after inoculation with pathogen. Germinated seeds of date palm were soaked with T. harzianum alone and followed by T. harzianum before inoculation with pathogen stimulated growth of date palm seedlings i.e., length and fresh weight of shoot and root systems. It was preliminary investigation on screening antagonistic biocontrol agents against fungal pathogen causing root rot disease of date palm.
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