Evaluation of comparative efficacy of native isolate of Trichoderma Viride-against rhizome rots disease of ginger

All seven isolate of Trichoderma viride were able to inhibit the mycelial growth of Pythium myriotylum ranging between 44.7 to 69.4 per cent. Trichoderma viride isolate-III proves most lethal with maximum (69.4 per cent) inhibition of mycelial growth of Pythium myriotylum followed by isolate-V. All the isolates were found fully compatible with mancozeb at the concentrations of 0.025, 0.05, 0.1 and 0.2 per cent. Based on efficacy obtained under in In vitro the efficacy of native isolate-III of Trichoderma viride tested against rhizome rot of ginger in comparison with mancozeb and hot water treatment under field condition. Results shows that maximum sprouting of rhizome (89.0 and 78.6) along with minimum disease incidence (5.4 and 5.2 per cent) was observed with the treatment consisting of soil application of Trichoderma viride + FYM @20g/kg, mixed 7 days before sowing and watering regularly followed by seed treatment with Trichoderma viride 2g/l water for 30 minutes + soil application of Trichoderma viride (84.0 and 74.8 per cent) with 9.2 and 9.3 per cent disease incidence during 2009–10 and 2010–11, respectively. The maximum average yield (kg/plot) was recorded in case of soil application of Trichoderma viride + FYM @20g/kg, mixed 7 days before sowing and watering regularly (9.5 and 7.0 kg/plot) followed by seed treatment with Trichoderma viride 2g/l water for 30 minutes + soil application of Trichoderma viride with 9.0 and 6.8 kg yield/plot and with seed treatment with hot water @ 51DC for 10 minutes + seed treatment with Trichoderma viride 2g/l water for 30 minutes, with the 8.2 and 6.4 kg yield/plot during 2009–10 and 2010–11, respectively.