EXPLOITING THE BIOCONTROL POTENTIAL OF TRICHODERMA HARZIANUM AGAINST ROOT KNOT NEMATODE MELOIDOGYNE INCOGNITA IN TOMATOG.N. GRACE, T. N. SHIVANANDA, M. S. RAO AND R. UMAMAHESWARIAbstract Root knot nematodes (Meloidogyne spp.) have been recognized as serious pathogens of many economically important crops. Extensive use of pesticides against parasitic nematodes is reported to cause health hazards; hence there is growing attention in the exploitation of biological control especially antagonistic fungi for the control of nematodes. In order to evaluate the efficacy of native isolates of Trichoderma against root knot nematodes, four isolates of Trichoderma were selected. Culture filtrates of all the four isolates showed antagonistic effect against M. incognita. Isolate TH-IV was found to be effective among all the isolates in causing mortality and hatching inhibition. Maximum mortality (94.53%) was recorded at 100% concentration followed by 72.47, 62.42 and 52.04 percent mortality at 75%, 50%, 25% concentrations of culture filtrates, respectively. Maximum rate of inhibition in hatching (92.13%) was recorded at 100% concentration followed by other concentrations of culture filtrates. The bioefficacy of T. harzianum (TH-IV) liquid formulation was evaluated both under green house and field conditions. Under greenhouse conditions, seed treatment along with soil application of 2 tons/ha of vermicompost enriched with 5 l of T. harzianum have showed maximum increase in the plant growth parameters. Field assessment demonstrated significant inhibition of nematode reproduction, suppression of root galling and an increase of tomato yield compared with the control.
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