Is tank mixing site-specific premixes and multi-site fungicides effective and economic for managing soybean rust? a meta-analysis

Soybean rust (SBR), caused by Phakopsora pachyrhizi, is controlled with sequential applications of commercial premixes containing two and, more recently, three site-specific fungicides. However, their efficacy has been reduced due to the development of fungicide resistance in the fungal population;...

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Veröffentlicht in:Crop protection 2022-01, Vol.151, p.105839, Article 105839
Hauptverfasser: Machado, Franklin J., Barro, Jhonatan P., Godoy, Cláudia V., Dias, Alfredo R., Forcelini, Carlos A., Utiamada, Carlos M., Andrade, Edson R., Juliatti, Fernando C., Grigolli, José Fernando J., Campos, Hercules D., Araujo, Ivan Pedro, Trentini Roy, João Mauricio, Nunes, José, da Silva, Luís Henrique C.P., Canteri, Marcelo G., Senger, Marina, Müller, Mônica A., Martins, Mônica C., Debortoli, Mônica Paula, Furlan, Silvânia H., Madalosso, Tiago, Carlin, Valtemir J., Venâncio, Wilson S., Del Ponte, Emerson
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Sprache:eng
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Zusammenfassung:Soybean rust (SBR), caused by Phakopsora pachyrhizi, is controlled with sequential applications of commercial premixes containing two and, more recently, three site-specific fungicides. However, their efficacy has been reduced due to the development of fungicide resistance in the fungal population; hence the use of multi-site fungicides in tank mixing has been encouraged. In this work we used data from 45 uniform fungicide trials conducted across eight Brazilian states during three crop seasons (2014/15, 2015/16, and 2017/18) to identify scenarios when the practice of adding multi-site fungicides in commercial premixes was both technical- and cost-effective. Premixes of quinone outside inhibitor (QoI) + demethylation inhibitors (DMI) or succinate dehydrogenase inhibitors (SDHI) were applied alone, or tank mixed with multi-site fungicides. Three premixes (PICOxystrobin + CYPRoconazole, PYRAclostrobin + FLUXapyroxad and AZOXystrobin + BENZovindiflupyr) were tank mixed with one of three multi-site fungicides (+MANCozeb, +COPpeR oxychloride, and +ChLORothalonil). The benefits from tank mixing a multi-site tended to be highest for the least effective premix. Improvements in control efficacy (C‾, percent point; p.p.) and yield response (D‾, kg/ha) ranged from 3 to 15 p.p. and 58–240 kg/ha, respectively. The improvements in C‾ and D‾ were affected by severity in the non-treated check; significantly higher improvements in D‾ were determined in trials experiencing high SBR severity levels (>80%). The economic analysis for scenarios of soybean price and multi-site costs showed that the addition of +MANC, given its lower price, was more likely to be profitable compared with +CLOR and +COPR, particularly when tank mixed with the least effective commercial premix. •The benefits from tank mixing a multi-site were the greatest for the least effective premix.•The improvements in control efficacy and yield were affected by disease pressure.•Tank mixing a multi-site was more beneficial in trials experiencing high disease pressure.•The addition of mancozeb, given its lower price, was more likely to be profitable than other protectants.
ISSN:0261-2194
1873-6904
DOI:10.1016/j.cropro.2021.105839