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Performance of dual and triple fungicide premixes for managing soybean rust across years and regions in Brazil: A meta‐analysis
Author(s) -
Barro Jhonatan P.,
Alves Kaique S.,
Godoy Cláudia V.,
Dias Alfredo R.,
Forcelini Carlos A.,
Utiamada Carlos M.,
Andrade Júnior Edson R.,
Juliatti Fernando C.,
Grigolli Fernando J.,
Feksa Heraldo R.,
Campos Hercules D.,
Chaves Ione C. P. V.,
Araújo Júnior Ivan P.,
Roy João Mauricio T.,
Nunes Júnior José,
Belufi Luana M. R.,
Carneiro Luciana C.,
Silva Luís H. C. P.,
Canteri Marcelo G.,
Goussain Júnior Marcio M.,
Senger Marina,
Meyer Maurício C.,
Dias Moab D.,
Müller Mônica A.,
Martins Mônica C.,
Debortoli Mônica P.,
Tormen Nédio R.,
Furlan Silvânia H.,
Konageski Tiago F.,
Carlin Valtemir J.,
Venâncio Wilson S.,
Del Ponte Emerson M.
Publication year - 2021
Publication title -
plant pathology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.928
H-Index - 85
eISSN - 1365-3059
pISSN - 0032-0862
DOI - 10.1111/ppa.13418
Subject(s) - fungicide , azoxystrobin , biology , tebuconazole , demethylation , horticulture , agronomy , biochemistry , gene expression , gene , dna methylation
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 ( C ¯ , %), 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 ( D ¯ , 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 C ¯ and D ¯ 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 D ¯ 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.