Vol. 12, Issue 12 (2023)

Author(s):
Rahul Gadde, Mallikarjun Kenganal, Gururaj S, Yenjerappa ST and Muniswamy S

Abstract:
An attempt was made to test the efficacy of fungicides and bio-control agents against Macrophomina phaseolina causing stem blight in pigeonpea under laboratory conditions for identifying suitable fungicides for field application. Experiment was carried using poison food technique employing contact, systemic and combination of both formulation fungicides. Among the contact fungicides tested, copper sulphate pentahydrate 23.99% SC and mancozeb 75% WP recorded significantly higher mycelial inhibition of 100 percent at all the concentration of tested (0.1, 0.2 and 0.3%). In case of systemic fungicides carbendazim 50% WP, tebuconazole 25% EC, propiconazole 25% EC thiophanate methyl 70% WP, hexaconazole 5% SC, difenoconazole 25% EC, Kresoxim-methyl 44.3% W/W recorded 100 percent mycelial inhibition at all the concentrations tested. With respect to combination of both contact and systemic mode of action fungicides all the tested chemicals showed cent percent inhibition at all the concentrations tested except in Thiophonatemethyl 45%+Pyraclostrobin 5% FS which showed 83.70 percent inhibition at 0.1 and 0.2 concentrations and 89.26 percent inhibition at 0.3 percent concentration. In case of Bio-controls tested Trichoderma asperellum showed maximum mycelial inhibition (81.06%) while Pseudomonas fluorescence and Bacillus subtilis showed zero percent inhibition. These results are basis and indicators for selecting the best performing fungicides in formulating the strategies for management of Macrohomina stem blight disease due to their promising effect and efficacy against the causal organism.