Bio-efficacy of a Combination Fungicide against Blast and Sheath Blight Diseases of Paddy
D. Pramesh *
All India Coordinated Rice Improvement Programme, Agricultural Research Station, Gangavathi, Karnataka, Pin-583 227, India and Department of Plant Pathology, University of Agricultural Sciences, Raichur, Karnataka, India
Maruti .
All India Coordinated Rice Improvement Programme, Agricultural Research Station, Gangavathi, Karnataka, Pin-583 227, India and Department of Plant Pathology, University of Agricultural Sciences, Raichur, Karnataka, India
K. M. Muniraju
All India Coordinated Rice Improvement Programme, Agricultural Research Station, Gangavathi, Karnataka, Pin-583 227, India and Department of Plant Pathology, University of Agricultural Sciences, Raichur, Karnataka, India
G. S. Guruprasad
All India Coordinated Rice Improvement Programme, Agricultural Research Station, Gangavathi, Karnataka, Pin-583 227, India
K. Mahantashivayogayya
All India Coordinated Rice Improvement Programme, Agricultural Research Station, Gangavathi, Karnataka, Pin-583 227, India
B. G. M. Reddy
All India Coordinated Rice Improvement Programme, Agricultural Research Station, Gangavathi, Karnataka, Pin-583 227, India
S. B. Gowdar
Department of Plant Pathology, University of Agricultural Sciences, Raichur, Karnataka, India
B. S. Chethana
All India Coordinated Rice Improvement Programme, VC Farm, Mandy, Karnataka, Pin-571 405, India
*Author to whom correspondence should be addressed.
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.
Keywords: Rice, blast, sheath blight, trifloxystrobin 25% Tebuconazole 50%, PDI