Effect of different carbon sources on the antagonistic potential of Trichoderma viride (Wild and mutants)

Antagonistic potentiality of Trichoderma viride was analyzed against Pythium aphanidermatum causing rhizome rot of turmeric, by employing dual culture technique. Different carbon sources such as Fructose, Galactose, Dextrose, Maltose, Starch, Glucose and Sucrose were incorporated into Czapek Dox agar culture medium at the concentration of 3% for evaluation of their effect on antagonistic activity of Trichoderma viride wild (Tv_w) and mutants (Tv_UV-40 and Tv_{SA- 56}). Sucrose was found to be the most favorable carbon source in all Trichoderma viride strains (Tv_w Tv_UV-40 and Tv_SA-56 with showed inhibition in the growth of Pythium aphanidermatum to the extent of 64.6, 68.8 and 69.4 % respectively. Whereas, lowest antagonistic activity was recorded with Galactose in case of Tv_w (57.7 %) and Tv_SA-56 (55.5%) strains, whereas Tv_UV-40 showed enhanced antagonistic potential (61.1%).