Abstract
In the present investigation, Trichoderma koningii was evaluated in vitro for its antagonistic activity against four fungal pathogen viz., Fusarium oxysporum, Fusarium solani, Alternari solani and Rhizoctonia solani causing vegetable diseases. T. koningii strongly antagonized with all pathogenic fungi in dual culture assay and gave maximum inhibition of mycelia growth (91.09%). Volatile metabolites produced by T. koningii exhibited highest growth inhibition rate (54.67%). The Metabolites released from T. koningii were tested in culture medium against all pathogens. Cell free metabolites of T. koningii inhibited the growth of all four pathogens and appeared to be fungicidal in its activity.
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