Predicting Asian Soybean Rust Epidemics Based on Off-Season Occurrence and El Niño Southern Oscillation Phenomenon in Paraná and Mato Grosso States, Brazil

Minchio, Claudinei Antonio; Fantin, Lucas Henrique; Caviglione, João Henrique; Braga, Karla; Silva, M. A. Aguiar e; Canteri, Marcelo Giovanetti

doi:10.5539/jas.v10n11p562

Cited by 8 publications

(5 citation statements)

References 18 publications

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“…The increase in severity of Asian rust during the crop is determined by environmental factors, including night temperature (between 18 and 26.5 o C), continuous leaf wetness and constant rainfall (EMBRAPA, 2013b;MINCHIO et al, 2018). In the present study, Asian rust was late diagnosed in both seasons, that is, in the first half and at the end of February for the 2016/17 and 2017/18 crops, respectively (Figure 1).…”

Section: Resultssupporting

confidence: 46%

Use of systemic fungicides combined with multisite to control of asian rust and soybean yield

Netto¹,

Sacon²,

Gallina³

et al. 2020

COLLOQ AGRARIAE

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Asian soybean rust is an aggressive disease and chemical control must be handled assertively to minimize productivity damage. The objective was to evaluate systemic fungicides and multisite mancozeb, combined or not, and the effects on disease control and soybean yield, cv. 'BMX Lança'. The work was conducted in the field in the 2016/17 and 2017/18 crops, in a randomized complete block design, with four replications. The following treatments were evaluated: T+P) trifloxystrobin + prothioconazole; A+B) azoxystrobin + benzovindiflupyr; T+P+MB) trifloxystrobin + prothioconazole + mancozeb; A+B+MB) azoxystrobin + benzovindiflupyr + mancozeb; MB) mancozeb; and Control (without fungicide application). After the occurrence of the first symptoms of the disease, the severity (%) was evaluated in five trifolia per plot, every seven days, making it possible to calculate the area under the disease progress curve (AUDPC). The yield components and productivity (kg ha -1 ) were also evaluated. In both crops, the combination of systemic fungicides and mancozeb reduced the severity (%) and progress of Asian rust, reaching a control above 81%. Treatment with trifloxystrobin + prothioconazole + mancozeb (T+P+MB) obtained the highest percentages of control (94.5% -2016/17, and 93.7% -2017/18) of Asian rust, and provided, in the 2016/17 crop, productivity at 15 sc ha -1 , in relation to the fungicide applied alone (T+P). The combination of systemic fungicides and mancozeb, as proposed in this work, reduces the severity and progress of Asian rust and ensures the maintenance of the productive potential of the soybean.

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Section: Resultssupporting

confidence: 46%

Use of systemic fungicides combined with multisite to control of asian rust and soybean yield

Netto¹,

Sacon²,

Gallina³

et al. 2020

COLLOQ AGRARIAE

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“…Using SBR prevalence data, also reported by the consortium, Minchio et al (2018) explored the effects of weather and ENSO-related variables on the final prevalence data reported for two states in Brazil: Mato Grosso (Mid-Western Region) and Paraná (PR in Fig. 1), both spanning 11 seasons (from 2004/05 to 2014/15 seasons).…”

Section: Discussionmentioning

confidence: 99%

“…For soybean rust, three Brazilian studies used weather-based models, which were linked to a long series of historical weather and crop models, to predict SBR risk and investigate its association with the ENSO phases (Del Ponte et al 2011;Radons et al 2021;Fattori et al 2021). The effect of SST in the El Niño 3.4 region on the SBR final seasonal prevalence (cumulative number of reports) was investigated for two states: Paraná and Mato Grosso during 11 growing seasons (2004 to 2014) (Minchio et al 2018).…”

Section: Introductionmentioning

confidence: 99%

Modeling the effect of El Niño Southern Oscillation on the onset of soybean rust in Southern Brazil

Alves¹,

Ponte²

2021

Preprint

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Soybean rust (SBR; Phakopsora pachyrhizi) is one of the most damaging fungal diseases of soybean, particularly in Brazil where farmers rely on fungicide sprays. Disease risk is variable among regions, as well as between years; the main drivers include the availability of inoculum early in the season and both pre- and within-season weather conditions. El Niño-southern oscillation (ENSO) is known to affect global climate. In southern Brazil, precipitation levels are above normal during spring and summer in the El Niño phase. Here, we describe the temporal and spatial features of SBR spread across municipalities in Southern Brazil and evaluate the effects of ENSO events and anomalies on the sea surface temperature (SST) in the El Niño 3.4 region in the central Pacific on those features. We used data provided by the 'Consórcio Antiferrugem' on disease reports during 17 crop seasons (2004/05 to 2020/21). The temporal and spatial aspects of SBR epidemics were variable among the years and significantly affected by El Niño events. A spatially structured Cox proportional Bayesian model suggested that the anomalies in the normal SST during May-June-July and October-November-December trimesters increase the risk of early SBR onset in municipalities. In general, epidemics are expected to establish and spread early and faster across the entire region of southern Brazil during the El Niño seasons. Results of this study provide insights into the large-scale spread of soybean rust across southern Brazil, which may be useful for seasonal outlook and decision-making when planning disease management.

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“…As estratégias de manejo recomendadas para o controle da doença compreendem a adoção de medidas conjuntas, que incluem a utilização de cultivares de ciclo precoce e semeadura no início da época recomendada, vazio sanitário e eliminação de plantas de soja voluntárias na entressafra (21), monitoramento da lavoura através de coletores e armadilhas (5), uso de cultivares com genes de resistência e controle químico, com a aplicação de fungicidas via foliar (16).…”

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Sensibilidade de populações de Phakopsora pachyrhizi ao fungicida protioconazol

et al. 2020

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RESUMO A redução na eficiência de fungicidas sintéticos está associada a seleção de indivíduos que apresentam alterações genéticas que conferem resistência aos ingredientes ativos. A sinalização de variações na frequência de indivíduos resistentes nas populações de fungos pode ser quantificada através da concentração efetiva 50 (CE50). O objetivo do trabalho foi avaliar a sensibilidade de populações de Phakopsora pachyrhizi coletadas durante a safra 2017/18 em diferentes regiões produtoras de soja ao i.a protioconazol (IDM), através da concentração efetiva que resulta em 50% de eficiência de controle (CE50). Folíolos de soja foram tratados com o i.a nas concentrações zero; 0,0625; 0,125; 0,25; 0,5; 1; 2; 4; 8 e 16 mg L-1 e inoculados com uredósporos de P. pachyrhizi provenientes de 17 localidades distribuídas no Brasil e Paraguai. Os folíolos inoculados foram mantidos em placas de Petri plásticas de 15cm de diâmetro com papel filtro umedecido e incubadas em câmaras de crescimento a 23o C ±2o C. A severidade da doença foi avaliada 15 dias após a inoculação. Através do ajuste log-logístico foi estimada a concentração efetiva que apresenta 50% de eficiência de controle (CE50) para cada população. Foi observada variação na sensibilidade entre as populações do fungo P. pachyrhizi ao fungicida protioconazol, com valores de CE50 variando de 0,05 mg L-1 a 1,04 mg L-1 com média e mediana de 0,35 mg L-1. De acordo com os resultados obtidos houve alteração da sensibilidade das populações de P. pachyrhizi ao fungicida protioconazol conforme o local de origem das populações do fungo.

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Predicting Asian Soybean Rust Epidemics Based on Off-Season Occurrence and El Niño Southern Oscillation Phenomenon in Paraná and Mato Grosso States, Brazil

Cited by 8 publications

References 18 publications

Use of systemic fungicides combined with multisite to control of asian rust and soybean yield

Use of systemic fungicides combined with multisite to control of asian rust and soybean yield

Modeling the effect of El Niño Southern Oscillation on the onset of soybean rust in Southern Brazil

Sensibilidade de populações de Phakopsora pachyrhizi ao fungicida protioconazol

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