Efficacité au champ de l’ANTRACOL 70 WP, un fongicide à base du Propineb 70%, sous pression naturelle de l’helminthosporiose du riz due à <I>Bipolaris oryzae</I>

L’helminthosporiose est l’une des maladies fongiques majeures, à l’origine des pertes de production rizicole en Côte d’Ivoire. Dans le but de réduire ces pertes, une étude portant sur l’évaluation de l’efficacité du fongicide ANTRACOL 70 WP (Propineb 70%) a été réalisée sous pression naturelle de maladie. Trois doses du fongicide ANTRACOL 70 WP (1,5 kg ha-1, 2 kg ha-1, 2,5 kg ha-1) et une dose du fongicide de référence COGA 80 WP (mancozèbe, 800 g/kg) à 2 kg ha-1 ont été évaluées. Les résultats obtenus ont montré que les gains de rendement dus à l’utilisation du fongicide sont en moyenne de 80,05%. La note de sévérité (2) enregistrée dans la parcelle traitée avec l’ANTRACOL 70 WP a été identique à celle obtenue dans la parcelle traitée au COGA 80 WP. Ce résultat montre que l’ANTRACOL 70 WP a été efficace contre l’helminthosporiose du riz. Les rendements en paddy acquis sous les différents traitements fongicides ont montré qu’à la dose de 2,5 kg ha-1, l’ANTRACOL 70 WP a permis de doubler au moins le rendement en paddy (2,72 t ha-1) par rapport aux parcelles traitée au COGA (1,36 t ha-1) et non traitée au fongicide (0,89 t ha-1).Mots clés : Riz pluvial, helminthosporiose, sévérité, ANTRACOL 70 WP, Côte d’Ivoire. English Title: Field efficacy of ANTRACOL 70 WP, a fungicide based on Propineb 70%, under natural pressure of rice leaf brown spot disease caused by Bipolaris oryzaeBrown spot is one of the major fungus diseases inducing yield losses of rice in Côte d’Ivoire. In order to reduce those losses, a study to assess the effectiveness of the fungicide ANTRACOL 70 WP (propineb 70%) was carried out under disease natural pressure. Three doses of the fungicide ANTRACOL 70 WP (1.5 kg ha-1, 2 kg ha-1, 2.5 kg ha-1) and a recommended dose of a reference fungicide COGA 80 WP (mancozeb, 800 g / kg) at 2 kg ha-1 were evaluated. The results obtained showed that the average yield gains due to the use of this fungicide was 80,05%. The severity score recorded in the plot treated with ANTRACOL 70 WP (note = 2) was identical to that obtained in the plot treated with COGA 80 WP. This result shows that ANTRACOL 70 WP was effective against brown spot disease of rice. The paddy yields recorded under the various fungicidal treatments have shown that at a dose of 2.5 kg ha-1, the ANTRACOL 70 WP allowed to at least double the paddy yield (2.72 t ha-1) compared to plots treated with COGA (1.36 t ha-1) and not treated with fungicide (0.89 t ha-1).Keywords: Rainfed rice, brown spot disease, severity, ANTRACOL 70 WP, Côte d´Ivoire.

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

Journal of Global Innovations in Agricultural and Social Sciences ◽

10.22194/jgiass/8.919 ◽

2020 ◽

pp. 177-182

Author(s):

Arsène Boka ◽

Odette Dogbo Denezon

Keyword(s):

Oryza Sativa ◽

Cote D'ivoire ◽

Côte D’Ivoire ◽

Oryza Sativa L ◽

Crop Protection ◽

Control Plot ◽

Brown Spot ◽

Bipolaris Oryzae ◽

Cote D’Ivoire ◽

Côte D'ivoire

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.

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