In vitro evaluation of fungicides against fungal foliar pathogens of cotton

Abstract

The fungicides, individually and combination products viz., hexaconazole, carbendazim, propiconazole, azoxystrobin, hexaconazole+captan, trifloxystrobin+tebuconazole, kresoxim methyl and mancozeb were evaluated In vitro against fungal foliar pathogens of cotton including Alternaria, Corynespora, Helminthosporium and Myrothecium by employing poisoned food technique. Hexaconazole @ 0.2%, propiconazole @ 0.1%, hexaconazole+captan @ 0.1% and mancozeb @ 0.3% showed 100 per cent inhibition against Alternaria and Helminthosporium. Trifloxystrobin+tebuconazole also caused 100 per cent inhibition of Helminthosporium but 78.86 per cent inhibition in case of Alternaria. Carbendazim @ 0.1% was most effective against Corynespora with 100 per cent inhibition of mycelial growth followed by hexaconazole+captan (82.83%), hexaconazole (79.03%) and trifloxystrobin+tebuconazole (75.74%), mancozeb (75.60%) and propiconazole (75.25%). Hexaconazole and propiconazole showed 100 per cent inhibition against Myrothecium followed by mancozeb (86.82%), hexaconazole+captan (76.48%) and trifloxystrobin+tebuconazole (76.20%), respectively. Fungicides with broad spectrum activity against leaf spot fungi indicate their usefulness in integrated disease management of cotton.