Effects of Duration, Frequency, and Temperature of Leaf Wetness Periods on Soybean Rust

Melching, J. S.; Dowler, W. M.; Koogle, D. L.; Royer, M. H.

doi:10.1094/pd-73-0117

Cited by 110 publications

(104 citation statements)

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“…As a consequence, several disease models have been developed to assess and predict the risk of the disease at various geographical scales (Del Ponte et al, 2006a). A common feature of most ASR models is the integration of meteorological data as predictors because there is a large body of research that has demonstrated that single processes in the fungal life cycle (Melching et al, 1989) In this review our objective was to synthesize published information on the meteorological and environmental factors that affect both aerobiological and epidemiological components of ASR using an integrated systems approach that links basic components of the disease cycle. Also, a discussion of the key environmental variables is presented, and relevant knowledge gaps are identified that may directly affect future research.…”

Section: Introductionmentioning

confidence: 99%

Meteorological factors and Asian soybean rust epidemics: a systems approach and implications for risk assessment

Ponte

Esker²

2008

Sci. agric. (Piracicaba, Braz.)

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Favorable meteorological and environmental conditions are critical components that affect Asian soybean rust (ASR), caused by Phakopsora pachyrhizi, the most damaging fungal disease of soybean. In this review, we used available knowledge on the effect of meteorological factors affecting the disease to construct a systems-based approach to understand the risk of ASR epidemics. The systems approach is based on a hierarchical framework where relevant environmental factors that affect the key stages of the ASR disease cycle are identified and this included both aerobiological and epidemiological components. The formal framework we used examined the following epidemic characteristics: spore release, spore dispersal, spore deposition, infection efficiency, latent period and spore production. It provided the ability to identify the most important meteorologicalrelated factors along with relevant knowledge gaps from which the implications for disease forecasting were described. This is new information that can be used as a guide for further epidemiological research and especially to develop and improve upon both local and regional risk models. Key words: Phakopsora pachyrhizi, plant epidemiology, risk prediction, climatology, plant diseases FATORES METEOROLÓGICOS E AS EPIDEMIAS DE FERRUGEM ASIÁTICA -UMA ABORDAGEM SISTÊMICA E IMPLICAÇÕES NA AVALIAÇÃO DE RISCORESUMO: Condições meteorológicas e ambientais são componentes críticos nas epidemias de ferrugem asiática da soja (FAS), doença causada pelo fungo Phakopsora pachyrhizi e que causa o maior dano na cultura da soja. Nesta revisão, o conhecimento sobre o efeito de fatores meteorológicos que influenciam nas epidemias foi usado para construir uma abordagem sistêmica para compreender o risco de epidemias de FAS. Esta é baseada em uma estrutura hierárquica onde os fatores relevantes que afetam os estágios chave no ciclo da doença foram delineados, incluindo os componentes aerobiológicos e epidemiológicos. As seguintes características epidemiológicas foram avaliadas: liberação de esporos, dispersão de esporos, deposição de esporos, eficiência de infecção, período latente e produção de esporos. O conhecimento sobre os fatores meteorológicos que afetam cada um dos componentes foi revisado, sendo identificados os fatores mais importantes e as falhas de conhecimento, bem como as implicações para a previsão da doença. A informação é importante para orientar a pesquisa epidemiológica futura e especialmente desenvolver e melhorar modelos de risco da doença em níveis locais a regionais. Palavras-chave: Phakopsora pachyrhizi, epidemiologia de plantas, previsão de risco, climatologia, doenças de plantas

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Section: Introductionmentioning

confidence: 99%

Meteorological factors and Asian soybean rust epidemics: a systems approach and implications for risk assessment

Ponte

Esker²

2008

Sci. agric. (Piracicaba, Braz.)

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“…Mean AUDPC was higher in 2007/08 than in 2006/07 in the NT plots (Table 2), possibly due to differences in the meteorological conditions between seasons (Figure 1). The mean temperature during specific stages of crop development, in both years, was within the favorable range (18 to 26.5ºC) for the development ASR epidemics (Alves et al, 2006;Melching et al, 1989;Yorinori et al, 2004). However, 2006/07 was in general warmer than 2007/08 during the crop cycle ( Figure 1A).…”

Section: Resultsmentioning

confidence: 85%

“…Continuous leaf wetness due to dew or rainfall under the optimal range of temperature (18 to 26.5ºC) favors disease development (Melching et al, 1989;Alves et al, 2006). In field epidemics, rainfall plays a major role in disease development (Del Ponte et al, 2006).…”

Section: Introductionmentioning

confidence: 99%

Managing soybean rust with fungicides and varieties of the early/semi-early and intermediate maturity groups

Koga¹,

Canteri²,

Calvo

et al. 2014

Trop. plant pathol.

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The objectives of this study were to evaluate the influence of soybean cultivar of two maturity groups, early/semi-early (E) or intermediate (I), on the management of Asian soybean rust (ASR) with fungicides and yield. Field trials were conducted during the 2006/07 and 2007/08 growing seasons. Seven cultivars of the two groups were tested in the first season and eight in the second season. All cultivars had plots that were treated (T) or non-treated (NT) with a commercial mixture of pyraclostrobin + epoxiconazole. ASR severity (%) was visually assessed several times during the crop cycle and yield (kg ha -1 ) was determined at harvest. Values of the standardized area under the disease progress curve (AUDPC) calculated from the severity assessments was higher in 2007/08 than in 2006/07, but no differences were found between cultivars of the E and I maturity groups. Differences in yield between between T and NT plots were lower in cultivars of the E group than those of the I group in both the 2006/07 (37.6% and 52.8% respectively) and the 2007/08 season (56.9% and 85.0%, respectively). A higher stability in yield was found for cultivars of the E maturity group compared to those of the I group.

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“…Para os espaçamentos de 0,45 e 0,8 m a DPM total foi de 10,2 e 11,0 h, e a DPM>50% foi de 3,5 e 3,2 h, respectivamente. Segundo Melching et al (16), o mínimo de 6 horas contínuas de molhamento é requerido para que a FAS se desenvolva. Furtado et al (8) relatam que se após 4 horas de molhamento houver uma interrupção, os uredósporos perdem sua capacidade infectiva, indicando tempo insuficiente para a penetração das hifas e intolerância a períodos secos após o início do processo de germinação.…”

Section: Resultsunclassified

“…Após a infecção, lesões e pústulas com uredósporos podem aparecer dentro de 7 ou 8 dias. Este ciclo de vida curto indica a velocidade com que ocorre a epidemia (2, 16,19).…”

Section: Introductionunclassified

Duração e porcentagem de molhamento foliar determinados pelo espaçamento entrelinhas, e influência sobre a ferrugem asiática da soja

et al. 2014

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A ferrugem asiática da soja causada pelo fungo Phakopsora pachyrhizi, é a doença de maior virulência e rápida disseminação da cultura no Brasil. Para que haja a infecção nas plantas são necessárias condições ambientais favoráveis, principalmente molhamento foliar quantificado pela duração do período de molhamento (DPM). Alterações no espaçamento entrelinhas de cultivo podem modificar a DPM. Este trabalho teve como objetivo verificar o efeito da utilização de dois espaçamentos entrelinhas sobre a duração e porcentagem do molhamento foliar, e a influência sobre a infecção inicial e desenvolvimento da doença. O experimento foi conduzido nas safras 2011/2012 e 2012/2013 na fazenda da Universidade Estadual de Londrina (23°34' S / 51°21' W), onde foram instalados coletores de esporo SIGA para identificar os uredósporos da P. pachyrhizi. Para quantificar a DPM e sua porcentagem foram utilizadas Árvores Eletrônicas de Molhamento, com sensores em três alturas (0,9m; 0,6m; 0,3m), nos espaçamentos entrelinhas de 0,45 e 0,8 m. Nas safras avaliadas foram detectados uredósporos da P. pachyrhizi antes do aparecimento dos primeiros sintomas. Foram necessárias cerca de 6 h de DPM acima 50% para que houvesse a infecção e manifestação dos sintomas de ferrugem. RESUMOPalavras-chave adicionais: Phakopsora pachyrhizi, epidemiologia, coletor de esporos, sensor de molhamento foliar.The Asian soybean rust, caused by the fungus Phakopsora pachyrhizi, is the disease of greatest virulence and rapid spread affecting soybean culture in Brazil. For the infection to occur in plants, favorable environmental conditions are necessary, especially leaf wetness measured based on the leaf wetness duration (LWD). Changes in the inter-row spacing can modify the LWD. This study aimed to verify the effect of using two inter-row spacings on leaf wetness duration and percentage, as well as the influence on Asian soybean rust initial infection and development. Duração e porcentagem de molhamento foliar determinados pelo espaçamentoentrelinhas, e influência sobre a ferrugem asiática da soja

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Effects of Duration, Frequency, and Temperature of Leaf Wetness Periods on Soybean Rust

Cited by 110 publications

References 0 publications

Meteorological factors and Asian soybean rust epidemics: a systems approach and implications for risk assessment

Meteorological factors and Asian soybean rust epidemics: a systems approach and implications for risk assessment

Managing soybean rust with fungicides and varieties of the early/semi-early and intermediate maturity groups

Duração e porcentagem de molhamento foliar determinados pelo espaçamento entrelinhas, e influência sobre a ferrugem asiática da soja

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