In-Vitro Evaluation of Trichoderma Isolates Against Major Soil Borne Pathogens in Groundnut (Arachis Hypogaea L)

Nine Trichoderma spp. Isolates were collected from different cropping systems (Groundnut, Red gram, and Tomato) in Chittoor district, and evaluated against three major soil borne pathogens of groundnut such as Aspergillus Niger, Sclerotium rolfsii and Macrophomina phaseolina. Against A. Niger, GRT-3 isolate showed maximum percent of inhibition (65.87%) followed by TRT-2 (65.50%). Case of S. rolfsii, TRT-1 isolate showed maximum per cent of inhibition (68.75%) followed by GRT-1 (68.00%). The highest inhibition zone was recorded in GRT-3 (0.50cm) with 57.50 per cent inhibition followed by TRT-2 (0.43cm). Against M. phaseolina, TRT-2 isolate showed maximum per cent of inhibition (70.50%) followed by TRT-1 (70.00%), but isolate GRT-3 overgrew pathogen (.3.05cm) with sporulation, as in case of RRT1 and RRT-2 overgrew pathogen (3.50cm) without sporulation.