Vol. 8, Special Issue 12, Part A (2024)

Charcoal rot caused by Macrophomina phaseolina (Tassi) Goid., is one of the most widely distributed and destructive disease of soybean, causing accountable quantitative and qualitative losses. The pathogen can induce various diseases viz., charcoal / root / stem rots, leaf blight etc. in many crop plants. Therefore, present study entitled “Studies on Chemical Management of Charcoal rot of Soybean caused by Macrophomina phaseolina (Tassi.) Goid." were undertaken with the objectives viz., efficacy of fungicides (in vitro), at the Department of Plant Pathology, College of Agriculture, Parbhani, during Kharif, 2024. All of the seven each systemic (each @ 500 and 1000 ppm), non-systemic / contact (each @ 2000, and 2500 ppm) and combi-fungicides (each @ 2000 and 2500) evaluated in vitro were found to significantly inhibit mycelial growth of M. phaseolina, over untreated control. However, the most effective systemic fungicides were Carbendazim 50% WP, Azoxystrobin 25% EC and Hexaconazole 5% EC, with highest mycelial growth inhibition, respectively of 97.04%, 90.00% and 89.81% @500ppm and 100.00%, 91.30% and 95.00% @1000 ppm. The most effective contact fungicides found were Mancozeb 75% WP with cent per cent average mycelial growth inhibition (100.00%) followed by Chlorothalonil 75% WP (89.44) @2000 ppm. Mancozeb 75% WP and Chlorothalonil 75% WP, with cent per cent average mycelial growth inhibition (each 100.00%) @2500 ppm concentration. The most effective contact fungicides found were, Carbendazim 25% + Mancozeb 63% WP with cent per cent average mycelial growth inhibition (100.00%) followed by Trifloxystrobin 25% + Tebuconazole 50% WG (91.48%) @2000 ppm concentration, Carbendazim 12% + Mancozeb 63% WP and Trifloxystrobin 25% + Tebuconazole 50% WG with cent per cent average mycelial growth inhibition (each 100%) @2500 ppm.