Bio-efficacy of a Combination Fungicide against Blast and Sheath Blight Diseases of Paddy

Abstract

A new combination fungicide Nativo 75 WG composed of Trifloxystrobin 25% (Strobilurin) and Tebuconazole 50% (Triazole) was tested against rice blast and sheath blight diseases under field condition during Autumn 2014 and - 2015. The combination fungicide Trifloxystrobin 25% + Tebuconazole 50% (Nativo 75 WG) @ 0.4 g/l was found effective against blast and sheath blight diseases recording least Percent Disease Index (PDI) of 17.02 and 24.7 respectively. Other combination fungicide Tricyclazole 18% + Mancozeb 62% WP @ 1.5 g/l recorded blast PDI of 26.03 which is statistically on par with Kresoxim methyl 44.3 SC @ 1.0 ml/l and Tricyclazole 75 WP @               0.6 g/l. Other fungicides of the experiment such as Thifluzamide 24 SC @ 0.75 ml/l, Hexaconazole 4% + Zineb 68% @ 2.0 g/l and Carbendazim 12% + Mancozeb 63% WP @ 2.0 g/l are on par among themselves but stands next to the Trifloxystrobin 25% + Tebuconazole 50% (Nativo 75 WG) @ 0.4 g/l in reducing sheath blight PDI.  Significant increase in the grain yield was observed in the plots treated with test chemical Nativo 75 WG @ 0.4 g/l (55.13 q/h) compared to the other fungicidal treatments which recorded the yield in the range of 40.75 to 48.12 q/h.