FIELD EVALUATION OF NATIVO 300 SC FUNGICIDE (TRIFLOXYSTROBIN 100 g l-1 + TEBUCONAZOLE 200 g l-1) ON RICE BROWN SPOT (Oryza sativa L.)

Rice brown spot caused by the fungus Bipolaris oryzae is one of the constraints affecting the productivity of rice (Oryza sativa L.) in Côte d'Ivoire. As an effort to find ways of controlling this disease, the efficacy of the fungicide NATIVO 300 SC (trifloxystrobin 100 g l-1 + tebuconazole 200 g l-1) was tested in field conditions at Gbombélo in western Côte d'Ivoire. Five fungicide treatments were studied (water, 2 kg ha-1 of COGA 80 WP (800 g/kg mancozeb), 250 ml ha-1 of NATIVO 300 SC, 300 ml ha-1 of NATIVO 300 SC and 350 ml ha-1 of NATIVO 300 SC), in a Fischer experimental design with four replicates. Results showed a significant effect of fungicides on the severity of brown spot disease, with scores 2 to 3 times lower than in the control plot (water-treated). NATIVO 300 SC at the 350 ml ha-1 dose showed the same severity score as COGA 80 WP, the reference fungicide. Regarding the effect on the yield, NATIVO (300 SC, 350 ml ha-1) performed 9 times better (1.2825 tons ha-1) than the control plot (0.1392 ton ha-1), compared to 6 times for COGA 80 WP (0.9626 ton.ha-1). These results show that NATIVO (300 SC) is as effective, against rice brown spot (Bipolaris oryzae), as COGA 80 WP, the reference fungicide. However, at the dose of 350 ml ha-1, NATIVO 300 SC was the most efficient both from crop protection and agronomic perspective.