In vitro evaluation of different chemicals against Ustilaginoidea virens causing false smut of rice

Abstract

False smut of rice caused by Ustilaginoidea virens are the most common diseasethat can devastating the yield of rice up to 5-85 per cent in India. In the recent years, the false smut was highly emerging disease and the climate changes, high yield varieties and high use of nitrogenous fertilizers are the most favourable conditions for the development of this disease. The present study was conducted to understand the activity of different chemical fungicides on growth of U. virens on the artificial media. Five fungicides Carbendazim (Bavistin 50 WP), Trifloxystrobin+Tebuconazole (Nativo 756WG), Propiconazole (Tilt 25 EC), Carbendazim (12%)+ Mancozeb (63%) and Tricyclazole 75% WP were evaluated at different five concentration 60ppm, 125ppm, 250ppm, 500ppm and 1000 ppm against U. virens using food poison technique on the potato dextrose yeast agar (PDYA) media.The percent zone of inhibition of the pathogens shows that Tilt 25EC (Propiconazol) and Nativo 75WG (Tryfloxystrobin + Tebuconazole) at all tested concentration followed by Baan 75WP (Tricyclazole) @250ppm show 100% zone of mycelium growth in vitro condition. Tilt 25EC (Propiconazol) and Nativo 75WG considered as best fungicide and remaining tested fungicide were less effective but superior over control.