Variação da sensibilidade de populações de Phakopsora pachyrhizi a fungicidas inibidores da desmetilação no Brasil

Xavier, Sheila Ariana; Koga, Lucimara Junko; Barros, Daiane Cristina Martins; Canteri, Marcelo Giovanetti; Lopes, I. de O. N.; Godoy, C. V.

doi:10.1590/0100-5405/2068

Cited by 15 publications

(14 citation statements)

References 8 publications

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“…agropec. bras., Brasília, v.51, n.5, p.407-421, maio 2016 DOI: 10.1590/S0100-204X2016000500002 fungi populations (Schmitz et al, 2014;Xavier et al, 2015).…”

Section: Fungicidesunclassified

Asian soybean rust in Brazil: past, present, and future

Godoy

Seixas

Soares

et al. 2016

Pesq. agropec. bras.

163

199

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-Asian soybean rust, caused by the fungus Phakopsora pachyrhizi, is the most severe disease of the crop and can cause yield losses of up to 90%. The disease was first reported in Brazil in 2001. Epidemics of the disease are common in the country, where the fungus can survive year-round. Regulatory measures to reduce the inoculum between seasons and avoid late-season soybean have been adopted to manage the disease. Disease control has relied mainly on chemical control, but a lower sensibility of the fungus to fungicides has been reported in Brazil. Major-resistance genes have been mapped and incorporated into the cultivars. With the reduced efficacy of the fungicides, the adoption of integrated measures to control the disease will be important for the sustainability of the crop. This review presents the main changes in the soybean crop system caused by the introduction of the fungus in Brazil, the current management strategies adopted to avoid losses, and the new trends that, together with biotechnological strategies, can improve management in the future.Index terms: Glycine max, Phakopsora pachyrhizi, biotechnology, chemical control, genetic resistance, losses, management. Ferrugem-asiática da soja no Brasil: passado, presente e futuroResumo -A ferrugem-asiática da soja, causada pelo fungo Phakopsora pachyrhizi, é a doença mais severa da cultura e pode causar perdas de produtividade de até 90%. A doença foi relatada pela primeira vez no Brasil em 2001. Epidemias da doença são comuns no País, onde o fungo pode sobreviver durante todo o ano. Medidas regulatórias para reduzir o inóculo entre safras e evitar a semeadura tardia de soja têm sido adotadas para manejar a doença. O controle da doença tem se baseado principalmente no controle químico, mas uma menor sensibilidade do fungo aos fungicidas tem sido relatada no Brasil. Genes de resistência têm sido mapeados e incorporados às cultivares. Por causa da redução da eficiência dos fungicidas, a adoção de medidas integradas para o controle da doença será importante para a sustentabilidade da cultura. Este artigo de revisão apresenta as principais mudanças no sistema de produção da soja causadas pela introdução do fungo no Brasil, as medidas de controle atualmente usadas para evitar perdas, e as novas tendências que, juntas com estratégias biotecnológicas, podem melhorar o manejo da doença no futuro.Termos para indexação: Glycine max, Phakopsora pachyrhizi, biotecnologia, controle químico, resistência genética, perdas, manejo.

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“…agropec. bras., Brasília, v.51, n.5, p.407-421, maio 2016 DOI: 10.1590/S0100-204X2016000500002 fungi populations (Schmitz et al, 2014;Xavier et al, 2015).…”

Section: Fungicidesunclassified

Asian soybean rust in Brazil: past, present, and future

Godoy

Seixas

Soares

et al. 2016

Pesq. agropec. bras.

163

199

View full text Add to dashboard Cite

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“…The isolate from Caseiros-RS presented the lowest EC 50 value (0.20 mg L -1 ), while the Itaberá-SP isolate presented the highest value (1.64 mg L -1 ). XAVIER et al (2015) observed the EC 50 values between 0.000001 and 0.39 mg L -1 for isolates from eight Brazilian states. JULIATTI et al (2017) reported values between 0.0001 and 3.16 mg L -1 for isolates from Minas Gerais and Mato Grosso do Sul.…”

Section: Resultsmentioning

confidence: 90%

In vivo sensitivity of Phakopsora pachyrhizi to fungicides

et al. 2020

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Asian soybean rust is one of the most destructive diseases that can be found in this crop. It can be largely controlled by fungicide application. The objective was to assess the sensitivity of P. pachyrhizi isolates to fungicides. The tests were performed in a completely randomized design, with six replicates. The sensitivity of twelve isolates to site-specific and multisite fungicides at concentrations of 0.1; 1.0; 10.0, and 100.0 mg L-1, plus a control with absence of fungicide (0.0 mg L-1) was assessed. Soybean leaflets were immersed in the appropriate fungicide solutions, disposed in wet chambers in plastic boxes, and inoculated using each uredinia suspension of P. pachyhrizi (5.0 x 104 uredospores mL-1), separately. Boxes were incubated for 20 days at a temperature of 23°C and a 12-hour photoperiod. Next, the number of uredinia per cm2 on the abaxial face of each leaflet was evaluated. The active ingredients prothioconazole, trifloxystrobin, fluxapiroxade, trifloxystrobin + prothioconazole, trifloxystrobin + bixafen + prothioconazole, azoxystrobin + benzovindiflupyr, and azoxystrobin + benzovindiflupyr + diphenoconazole were highly fungitoxic for the majority of the isolates, with EC50 lower than 1.0 mg L-1. Diphenoconazole, azoxystrobin, and fenpropimorph were considered moderately fungitoxic for nine of the twelve isolates, with EC50 between 1 and 10 mg L-1. The multisites mancozeb and copper oxychloride presented EC50 responses classified as low toxic for the twelve isolates and eight for chlorothalonil (EC50 between 10 mg L-1 and 50 mg L-1). Site-specific fungicides showed high-to-moderate fungitoxicity to P. pachyrhizi isolates, even as the multisites presented moderate-to-less toxic activity.

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“…At that moment, Silva et al (2008) reported the control reduction in experiments, and later was confirmed by Reis and Deuner (Reis et al, 2015) in the P. pachyrhizi sensitivity reduction measured by the IC 50 . Later, Xavier et al (2015) demonstrated the presence of cross-resistance among DMIs.…”

Section: Figurementioning

confidence: 99%

Addition of Mancozeb to DMI + QoI, and SDHI + QoI Co-formulations Improving Control of Asian Soybean Rust

Reis¹,

Zanatta²,

Reis³

2020

JAS

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The reduced sensitivity of Phakopsora pachyrhizi to site-specific fungicides used to control Asian soybean rust by the current co-formulations needs investigation. To improve the rust control the performance of cyproconazole + picoxystrobin, tebuconazole + picoxystrobin, cyproconazole + azoxystrobin, epoxyconazole + pyraclostrobin, fluxapyroxade + pyraclostrobin, benzovindiflupyr + azoxystrobin, prothioconazole + trifloxystrobin and cyproconazole + trifloxystrobin mixtures added by five doses of the multisite mancozeb were evaluated. The fungicides were sprayed at four growth stages the first performed at R1 growth stage and the others with 15-18 days intervals. The rust severity was quantified, the control was calculated, the percentage of chlorophyll and the yield of soybean were determined. The mean of rust control by the mixtures without addition of the multi-site fungicide was 46% (21 to 71%). There was an increase in control efficiency due to addition and mancozeb doses in all treatments. Control over 80% was obtained with tebuconazole + picoxystrobin, fluxapyroxade + pyraclostrobin, benzovindiflupyr + azoxystrobin, and prothioconazole + trifloxystrobin added at least of 2.0 kg/ha mancozeb. In unsprayed plots the maximum 78% severity corresponded to 59% damage. There was an increase in chlorophyll content and soybean yield as a function of the mancozebe increased doses: 2,019 kg/ha in the unsprayed control and in the best treatment 5,132 kg/ha. Actual control reduction due to fungal decrease in sensitivity can be improved by the multi-site fungicide addition.

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Variação da sensibilidade de populações de Phakopsora pachyrhizi a fungicidas inibidores da desmetilação no Brasil

Cited by 15 publications

References 8 publications

Asian soybean rust in Brazil: past, present, and future

Asian soybean rust in Brazil: past, present, and future

In vivo sensitivity of Phakopsora pachyrhizi to fungicides

Addition of Mancozeb to DMI + QoI, and SDHI + QoI Co-formulations Improving Control of Asian Soybean Rust

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