Efficacy of Fungicides against Bipolaris sorokiniana under in vitro and in vivo Conditions

Spot blotch of wheat caused by Bipolaris sorokiniana could be effectively and economically controlled by two foliar sprays of either Propiconazole or Hexaconazole @ 0.1 per cent at fifteen days interval but on the basis of cost- benefit ratio Hexaconazole had an edge over Propiconazole. The harmful effects of fungicides to human and environment, there have been proved useful and economical in the control of spot blotch. Non systemic and systemic foliar fungicides belonging to the dithiocarbamate and Triazoles are found to be effective. Foliar applications of systemic fungicides between heading and grain filling stages, are cost effective. Propiconazole, Hexaconazole and Difenaconazole + Propiconazole at 250 ppm completely inhibited the mycelial growth of B. sorokiniana. Carbendazim and Copper oxychloride also causes and complete inhibition but at 500 and 1000 ppm, respectively but Mancozeb could not give complete inhibition even at 1000 ppm.