Risk and management of fungicide resistance in the Asian soybean rust fungus
            <i>Phakopsora pachyrhizi</i>
            .

Godoy, C. V.; Thind, T. S.

doi:10.1079/9781845939052.0087

Cited by 37 publications

(28 citation statements)

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“…A variação na DE50 no monitoramento mostra uma coexistência de populações com diferentes níveis de sensibilidade aos IDMs no campo. Em função da extensa janela de semeadura da soja e das aplicações frequentes de fungicidas na cultura, é natural que populações menos sensíveis sejam selecionadas quando ocorrem aplicações sequenciais do mesmo fungicida, como ocorreu com os IDMs (10). Esse fato ressalta a necessidade de adotar estratégias antirresistência no início das recomendações de controle com novos fungicidas para retardar a seleção de isolados menos sensíveis/ resistentes aos fungicidas, prolongando a vida útil dos mesmos.…”

Section: Resultsunclassified

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

et al. 2015

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Durante as safras 2008/09, 2009/10 e 2010/11 foi monitorada a sensibilidade do fungo Phakopsora pachyrhizi aos fungicidas tebuconazol, ciproconazol, metconazol e protioconazol (inibidores da desmetilação, IDMs). Folhas destacadas de soja foram tratadas com os fungicidas em doses variando de zero a 32 mg L-1 (tebuconazol, ciproconazol e metconazol) e zero a 8 mg L-1 (protioconazol) e inoculadas com esporos de P. pachyrhizi provenientes de lavouras de soja de diferentes regiões produtoras. As folhas inoculadas foram incubadas em placas de Petri com papel umedecido, a 23°C ± 2ºC, e a severidade da ferrugem estimada 15 dias após a inoculação. Foram determinadas as doses efetivas para reduzir 50% da severidade da doença (DE50). O fungicida protioconazol apresentou a maior atividade intrínseca, com valores de DE50 variando de 0,000001 mg L-1 a 0,39 mg L-1. Os valores de DE50variaram de 0,001 mg L-1 a 1,49 mg L-1 para tebuconazol; 0,001 mg L-1 a 3,27 mg L-1 para ciproconazol e 0,004 mg L-1 a 3,89 mg L-1 para metconazol. As medianas de DE50 para todos os fungicidas avaliados foram inferiores a 0,5 mg L-1, nas três safras. As correlações (r) entre as DE50 dos quatro fungicidas foram significativas (p<0,05), mostrando a existência de resistência cruzada entre os fungicidas. A variação nos valores de DE50 no monitoramento mostra uma coexistência de populações com diferentes níveis de sensibilidade aos IDMs no campo.

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Section: Resultsunclassified

“…No Brasil, os fungicidas para o controle da ferrugem-asiática têm sido comparados em uma rede de ensaios cooperativos, (10,19).…”

Section: Methodsunclassified

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

et al. 2015

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“…Although fungicides can be effective in controlling soybean rust, there are still concerns related to the overuse of these fungicides which could result in strains of P. pachyrhizi becoming insensitive or resistant to a fungicide, as was reported in Brazil (Godoy 2012). Another concern that complicates fungicide application timing is the fact that P. pachyrhizi may, under some circumstances, have an extended latent period (up to 60 days) that would complicate the timing and use of curative and protective fungicides (Schneider et al 2009b;Ward et al 2012).…”

Section: Soybean Rust Managementmentioning

confidence: 99%

From Select Agent to an Established Pathogen: The Response to Phakopsora pachyrhizi (Soybean Rust) in North America

et al. 2015

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The pathogen causing soybean rust, Phakopsora pachyrhizi, was first described in Japan in 1902. The disease was important in the Eastern Hemisphere for many decades before the fungus was reported in Hawaii in 1994, which was followed by reports from countries in Africa and South America. In 2004, P. pachyrhizi was confirmed in Louisiana, making it the first report in the continental United States. Based on yield losses from countries in Asia, Africa, and South America, it was clear that this pathogen could have a major economic impact on the yield of 30 million ha of soybean in the United States. The response by agencies within the United States Department of Agriculture, industry, soybean check-off boards, and universities was immediate and complex. The impacts of some of these activities are detailed in this review. The net result has been that the once dreaded disease, which caused substantial losses in other parts of the world, is now better understood and effectively managed in the United States. The disease continues to be monitored yearly for changes in spatial and temporal distribution so that soybean growers can continue to benefit by knowing where soybean rust is occurring during the growing season.

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“…5). The number of fungicide trade products labeled to manage SBR increased from five in 2002 to approximately 70 in 2010 (20). The SBR-PIPE also aids in preventing unwarranted fungicide applications by providing information on where SBR is not considered a threat to soybean production.…”

Section: Management Advances For Sbrmentioning

confidence: 99%

A Coordinated Effort to Manage Soybean Rust in North America: A Success Story in Soybean Disease Monitoring

et al. 2014

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Existing crop monitoring programs determine the incidence and distribution of plant diseases and pathogens and assess the damage caused within a crop production region. These programs have traditionally used observed or predicted disease and pathogen data and environmental information to prescribe management practices that minimize crop loss. Monitoring programs are especially important for crops with broad geographic distribution or for diseases that can cause rapid and great economic losses. Successful monitoring programs have been developed for several plant diseases, including downy mildew of cucurbits, Fusarium head blight of wheat, potato late blight, and rusts of cereal crops. A recent example of a successful disease-monitoring program for an economically important crop is the soybean rust (SBR) monitoring effort within North America. SBR, caused by the fungus Phakopsora pachyrhizi, was first identified in the continental United States in November 2004. SBR causes moderate to severe yield losses globally. The fungus produces foliar lesions on soybean (Glycine max) and other legume hosts. P. pachyrhizi diverts nutrients from the host to its own growth and reproduction. The lesions also reduce photosynthetic area. Uredinia rupture the host epidermis and diminish stomatal regulation of transpiration to cause tissue desiccation and premature defoliation. Severe soybean yield losses can occur if plants defoliate during the mid-reproductive growth stages. The rapid response to the threat of SBR in North America resulted in an unprecedented amount of information dissemination and the development of a real-time, publicly available monitoring and prediction system known as the Soybean Rust-Pest Information Platform for Extension and Education (SBR-PIPE). The objectives of this article are (i) to highlight the successful response effort to SBR in North America, and (ii) to introduce researchers to the quantity and type of data generated by SBR-PIPE. Data from this system may now be used to answer questions about the biology, ecology, and epidemiology of an important pathogen and disease of soybean.

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Risk and management of fungicide resistance in the Asian soybean rust fungus Phakopsora pachyrhizi .

Cited by 37 publications

References 0 publications

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

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

From Select Agent to an Established Pathogen: The Response to Phakopsora pachyrhizi (Soybean Rust) in North America

A Coordinated Effort to Manage Soybean Rust in North America: A Success Story in Soybean Disease Monitoring

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