Performance of dual and triple fungicide premixes for managing soybean rust across years and regions in Brazil: A meta-analysis |
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| Authors: | Jhonatan P Barro Kaique S Alves Cláudia V Godoy Alfredo R Dias Carlos A Forcelini Carlos M Utiamada Edson R de Andrade Júnior Fernando C Juliatti Fernando J Grigolli Heraldo R Feksa Hercules D Campos Ione C P V Chaves Ivan P Araújo Júnior João Mauricio T Roy José Nunes Júnior Luana M R Belufi Luciana C Carneiro Luís H C P Silva Marcelo G Canteri Marcio M Goussain Júnior Marina Senger Maurício C Meyer Moab D Dias Mônica A Müller Mônica C Martins Mônica P Debortoli Nédio R Tormen Silvânia H Furlan Tiago F Konageski Valtemir J Carlin Wilson S Venâncio Emerson M Del Ponte |
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| Institution: | 1. Departamento de Fitopatologia, Universidade Federal de Viçosa, Viçosa, MG, Brazil;2. Embrapa Soja, Londrina, PR, Brazil;3. Fundação Chapadão, Chapadão do Sul, MS, Brazil;4. Universidade de Passo Fundo, Passo Fundo, RS, Brazil;5. Tagro, Londrina, PR, Brazil;6. Instituto Mato-Grossense do Algodão, Cuiabá, MT, Brazil;7. Universidade Federal de Uberlândia, Uberlândia, MG, Brazil;8. Fundação MS, Maracaju, MS, Brazil;9. Fundação Agrária de Pesquisa Agropecuária, Guarapuava, PR, Brazil;10. Universidade de Rio Verde, Rio Verde, GO, Brazil;11. Santa Cruz do Sul, Santagro, RS, Brazil;12. Fundação Mato Grosso, Rondonópolis, MT, Brazil;13. Centro de Pesquisa Agrícola Copacol, Cafelândia, PR, Brazil;14. Centro Tecnológico para Pesquisas Agropecuárias, Goiânia, GO, Brazil;15. Fundação Rio Verde, Lucas do Rio Verde, MT, Brazil;16. Universidade Federal de Goiás, Jataí, GO, Brazil;17. Agro Carregal, Rio Verde, GO, Brazil;18. Universidade Estadual de Londrina, Londrina, PR, Brazil;19. Assist Consultoria e Experimentação Agronômica Ltda, Campo Verde, MT, Brazil;20. 3M Experimentação Agrícola, Ponta Grossa, PR, Brazil;21. Universidade Federal do Tocantins, Gurupi, TO, Brazil;22. Círculo Verde Assessoria Agronômica e Pesquisa, Luís Eduardo Magalhães, BA, Brazil;23. Instituto Phytus, Santa Maria, RS, Brazil;24. Instituto Biológico, Campinas, SP, Brazil;25. Rural Técnica Experimentos Agronômicos Ltda, Querência, MT, Brazil;26. Agrodinâmica, Tangará da Serra, MT, Brazil;27. Universidade Estadual de Ponta Grossa, Ponta Grossa, PR, Brazil |
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| Abstract: | Soybean rust in Brazil is currently controlled with several commercial fungicide premixes composed of demethylation inhibitors (EPOXiconazole, CYPRoconazole, PROThioconazole, TEBUconazole), quinone-outside inhibitors (AZOXystrobin, TriFLoXystrobin, PYRAclostrobin, PICOxystrobin), and succinate demethylation inhibitors (BENZovindiflupyr, BIXaFen, FLUXapyroxad). Here, we summarize the performance of eight premixes evaluated in 177 cooperative trials conducted in 46 locations across 10 states from 2015 to 2020. All fungicide treatments were sprayed three times starting at R1/R2. Percentage control ( , %), from back-transforming meta-analytic estimates of the log of the ratio, ranged from 56.2% (PICO + CYPR) to 76.8% (BIXF + TFLX + PROT). Estimates of mean yield difference ( , kg/ha) between fungicide-treated and untreated plots were greatest for BIXF + TFLX + PROT (1,080) followed by PICO + BENZ (1,010), PYRA + EPOX + FLUX (981.5), AZOX + BENZ (910), TFLX + PROT (891), PICO +TEBU (682), TFLX + CYPR (646), and PICO + CYPR (600). Significant declines in both  and  in as little as 4 years were detected for AZOX + BENZ (35.3%; 550 kg/ha) and PICO + BENZ (15.5%; 359.8 kg/ha). Variance in  was reduced by the inclusion of baseline severity as covariate. In trials where baseline disease was ≥70%, yield was 250 kg/ha greater compared to areas with low baseline disease. Disease control and yield response were generally greater in the south-east, where the frequency of profitable scenarios was 30% higher on average than in the north-west. Results of this meta-analysis are critical for supporting decisions during planning of fungicide programmes. |
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| Keywords: | chemical control Phakopsora pachyrhizi profitability severity |
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