Meta-analysis of fungicide efficacy on soybean target spot and cost–benefit assessment |
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| Authors: | J P Edwards Molina P A Paul L Amorim L H C P da Silva F V Siqueri E P Borges H D Campos J Nunes Junior M C Meyer M C Martins R S Balardin V J Carlin J F J Grigolli L M de R Belufi C V Godoy |
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| Institution: | 1. Instituto Nacional de Tecnología Agropecuaria, Instituto de Patología Vegetal – CIAP, 5020 Córdoba, Argentina;2. Department of Plant Pathology, The Ohio State University, Ohio Agricultural Research and Development Center, Wooster, OH, 44691 USA;3. Departamento de Fitopatologia e Nematologia, Universidade de São Paulo, Piracicaba, SP, 13418-900 Brazil;4. Agro Carregal, Rio Verde, GO, 75907-454 Brazil;5. Fundação Mato Grosso, Rondonópolis, MT, 78750-000 Brazil;6. Fundação Chapadão, Chapadão do Sul, MS, 79560-00 Brazil;7. Universidade de Rio Verde, Rio Verde, GO, 75901-970 Brazil;8. Centro Tecnológico para Pesquisas Agropecuárias, Goiânia, GO, 74130-012 Brazil;9. Embrapa Soja, Londrina, PR, 86001-970 Brazil;10. Círculo Verde Assessoria Agronômica e Pesquisa, Luís Eduardo Magalhães, BA, 47850-000 Brazil;11. Universidade Federal de Santa Maria, Santa Maria, RS, 97111-970 Brazil;12. Agrodinâmica, Tangará da Serra, MT, 78300-000 Brazil;13. Fundação MS, Maracajú, MS, 79150-000 Brazil;14. Fundação Rio Verde, Lucas do Rio Verde, MT, 78455-000 Brazil |
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| Abstract: | Target spot of soybean has spread in Brazil, the southeastern United States and Argentina in the last decade. A collaborative network of field Uniform Fungicide Trials (UFT) in Brazil was created in 2011 to study the target spot control efficacy of fungicides, including azoxystrobin + benzovindiflupyr (AZ_BF), carbendazim (CZM), fluxapyroxad + pyraclostrobin (FLUX_PYRA), epoxiconazole + FLUX_PYRA (EPO_FLUX_PYRA), mancozeb (MZB) and prothioconazole + trifloxystrobin (PROT_TRIF). Network meta-analysis was used to conduct a quantitative synthesis of UFT data collected from 2012 to 2016 and to evaluate the effects of disease pressure (DP, low ≤ 35% target spot severity in the nontreated control < high) and year of experiment on the overall mean efficacy and yield response to each of the tested fungicides. Based on mean percentage control of target spot severity, the tested fungicides fall into three efficacy groups (EG): high EG, FLUX_PYRA (76.2% control relative to the nontreated control) and EPO_FLUX_PYRA (75.7% control); intermediate EG, PROT_TRIF (66.5% control) and low EG, MZB (49.6% control), AZ_BF (46.7% control) and CZM (32.4% control). DP had a significant effect on yield response. At DPLow, the highest response was due to PROT_TRIF (+342 kg ha?1, +12.8%) and EPO_FLUX_PYRA (+295.5 kg ha?1, +11.2%), whereas at DPHigh, EPO_FLUX_PYRA and FLUX_PYRA outperformed the other treatments, with yield responses of 503 kg ha?1 (+20.2%) and 469 kg ha?1 (+19.1%), respectively. The probability of a positive return on fungicide investment ranged from 0.26 to 0.56 at DPLow and from 0.34 to 0.66 at DPHigh. |
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| Keywords: | Corynespora cassiicola Glycine max network meta-analysis profitability yield |
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