Application timing of fungicides for the management of sugarcane orange rust

Chaulagain Bhim, Raid Richard Neil, Dufault Nicholas, van Santen Edzard, Rott Philippe. 2019. Application timing of fungicides for the management of sugarcane orange rust. Crop Protection, 119 : 141-146.

Quartile : Q1, Sujet : AGRONOMY

Résumé : Management of sugarcane orange rust, caused by Puccinia kuehnii, currently relies on fungicide applications in Florida. Field experiments were conducted in 2016 and 2017 in Belle Glade, FL to evaluate the efficacy and application timing of fungicides on progress of disease severity and sugarcane yields. Two treatment programs of three fungicide applications each were applied to sugarcane cultivar CL85-1040 susceptible to orange rust. Each program was also started at three different initiation dates separated by one month, and the first treatment was initiated when rust severity reached 5–10% on the top visible dewlap (TVD) leaf. Program A consisted of two consecutive applications of fluxapyroxad + pyraclostrobin followed by an application of metconazole. Program B consisted of three consecutive applications of fluxapyroxad + pyraclostrobin, fluxapyroxad, and pyraclostrobin. For each program, the three fungicide applications were separated by one month each and control plots remained unsprayed. Percent leaf area affected by rust was recorded every two weeks on TVD leaf and leaf +2 (leaf immediately below TVD leaf). Fungicide treatment programs initiated at the beginning of orange rust epidemics resulted in highest reduction of disease severity (41–45%) and highest yield increase (26–33%) as compared to untreated control plants. These results suggested that the application of fungicides initiated through early epidemic season are required for best management of sugarcane orange rust.

Mots-clés Agrovoc : Pucciniales, rouille, Saccharum officinarum, fongicide, application des pesticides, choix de la date, maladie des plantes, contrôle de maladies, Puccinia kuehnii

Mots-clés complémentaires : Triazole

Mots-clés libres : Carboxamide, Fluxapyroxad, Metconazole, Puccinia kuehnii, Pyraclostrobin, Strobilurin, Triazole

Classification Agris : H20 - Maladies des plantes
H01 - Protection des végétaux - Considérations générales

Champ stratégique Cirad : CTS 4 (2019-) - Santé des plantes, des animaux et des écosystèmes

Auteurs et affiliations

• Chaulagain Bhim, University of Florida (USA)
• Raid Richard Neil, University of Florida (USA)
• Dufault Nicholas, University of Florida (USA)
• van Santen Edzard, University of Florida (USA)
• Rott Philippe, CIRAD-BIOS-UMR BGPI (USA) ORCID: 0000-0001-6085-6159 - auteur correspondant

Source : Cirad-Agritrop (https://agritrop.cirad.fr/594365/)

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