Studies on water-soluble compounds extracted from
Trichoderma species, showed that all the Trichoderma
species tested inhibited the growth of C. paradoxa. T.
polysporum exhibited better growth inhibition at high
concentrations than the other Trichoderma species. The
effects of the inhibitory actions on C. paradoxa by T.
viride, T. polysporum and T. hamatum appear to be associated
with toxic volatile compounds produced by them.
The actual effect and mechanism involved is not known,
but Trichoderma spp. are known to produce a range of
metabolites that may affects the growth of microorganisms
and plants (Ghisalberti and Sivasithamparain, 1991).
The commercial fungicide benlate, at high concentrations
had average growth inhibition of C. paradoxa when
compared with the growth inhibitions by T. polysporum
and T. viride. Benlate, T. hamatum and T. aureoviride
were also found to be stimulating the growth of the
pathogen at low concentrations of 50, 30 and 10%.
However, these growth stimulations were less when
compared with the control treatments. Minimum inhibitory
concentration (MIC) of T. viride against C. paradoxa was
higher than the other Trichoderma species. Considering
the inhibition of C. paradoxa by T. polysporum at high
concentrations, it was concluded that the antagonist
exhibited better control of the pathogen.
at low concentrations were not known.
Studies on water-soluble compounds extracted fromTrichoderma species, showed that all the Trichodermaspecies tested inhibited the growth of C. paradoxa. T.polysporum exhibited better growth inhibition at highconcentrations than the other Trichoderma species. Theeffects of the inhibitory actions on C. paradoxa by T.viride, T. polysporum and T. hamatum appear to be associatedwith toxic volatile compounds produced by them.The actual effect and mechanism involved is not known,but Trichoderma spp. are known to produce a range ofmetabolites that may affects the growth of microorganismsand plants (Ghisalberti and Sivasithamparain, 1991).The commercial fungicide benlate, at high concentrationshad average growth inhibition of C. paradoxa whencompared with the growth inhibitions by T. polysporumand T. viride. Benlate, T. hamatum and T. aureoviridewere also found to be stimulating the growth of thepathogen at low concentrations of 50, 30 and 10%.However, these growth stimulations were less whencompared with the control treatments. Minimum inhibitoryconcentration (MIC) of T. viride against C. paradoxa washigher than the other Trichoderma species. Consideringthe inhibition of C. paradoxa by T. polysporum at highconcentrations, it was concluded that the antagonistexhibited better control of the pathogen.at low concentrations were not known.
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