Giberela do trigo: aspectos epidemiológicos e modelos de previsão

Ponte, Emerson M. Del; Mauricio, José; Fernandes, Cíntia Sanmartin; Pierobom, Carlos R.; Bergstrom, Gary C.; Br, Rodovia

doi:10.1590/s0100-41582004000600001

Cited by 20 publications

(16 citation statements)

References 47 publications

(68 reference statements)

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“…Isto possibilita o planejamento do agricultor com relação a uma eventual aplicação de fungicida. Na iminência de risco de dano econômico, os sistemas de previsão podem promover controle mais eficiente ou até mesmo propiciar a economia de aplicações em relação aos sistemas de aplicação calendarizada, resultando em menor impacto ambiental (Del Ponte et al, 2004).…”

Section: Resultsunclassified

Controle da ferrugem da folha do trigo (Puccinia triticina) em diferentes momentos de aplicação de fungicida

et al. 2013

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ABSTRACT:The fungicide application is important to the wheat field and its efficacy is related mainly to the biologic timing for the control. The aim of this paper was to study the influence of timing of fungicide application in the damage caused by leaf rust of wheat (P. triticina). A spore trap Siga was installed in the experimental area to assist the prediction of leaf rust before the first symptom. The cultivar used was CD 104 -susceptible to the rust -and the applications were made at 7, 14 and 21 days after the first symptoms of the leaf rust on the plants. It was evaluated in this experiment the area under the disease progress curve, obtained by the disease severity, and the yield (kg/ha) and hectolitre weight (g) indexes of the field. The trap Siga was able to detect spores of leaf rust before the disease symptoms, supporting its identification in the field in the first symptoms. The delay of the fungicide application increased the level of disease severity, reducing significantly the control level and causing considerable damage to the crop yield. It was verified yield losses approximately of 80 kg per day of delay of the application. KEYWORDS: RESUMO:A aplicação de fungicidas tem importante papel na cultura do trigo e sua eficácia está atrelada principalmente ao momento biológico para o controle. O objetivo deste trabalho foi estudar a influência do momento de aplicação de fungicida nos danos decorrentes da ferrugem da folha do trigo (P. triticina). Um coletor de esporos Siga foi instalado na área experimental a fim de auxiliar na previsão da ocorrência da ferrugem antes da manifestação dos sintomas. O cultivar utilizado foi o CD 104 -susceptível à ferrugem -e as aplicações foram realizadas aos 7, 14 e 21 dias após a manifestação dos primeiros sintomas de ferrugem nas plantas. Avaliaram-se neste experimento a área abaixo da curva de progresso da doença, obtida pela sua severidade, e os índices de produtividade (kg/ha) e peso hectolitro (g) da cultura. O coletor Siga foi capaz de detectar esporos de ferrugem antes da manifestação sintomática da doença, auxiliando na sua identificação no campo nos primeiros sintomas. O atraso nas aplicações de fungicida aumentou os níveis de severidade, reduzindo significativamente o nível de controle e ocasionando danos consideráveis à produtividade da cultura. Verificaram-se perdas de produtividade

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Section: Resultsunclassified

Controle da ferrugem da folha do trigo (Puccinia triticina) em diferentes momentos de aplicação de fungicida

et al. 2013

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“…The daily rate of cumulative proportion of extruded anthers in a cohort of heads (ANText) is calculated by another Weibull function, which parameters' values vary according to the daily mean temperature [2] (Del Ponte et al, 2004b).…”

Section: Model Structurementioning

confidence: 99%

“…On the other hand, process-oriented simulation models have been proposed as well. Detailed information on several FHB models has been reviewed recently (Del Ponte et al, 2004b).…”

Section: Introductionmentioning

confidence: 99%

A risk infection simulation model for fusarium head blight of wheat

Ponte¹,

Mauricio²,

Fernandes

et al. 2005

Fitopatol. bras.

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Fusarium Head Blight (FHB) is a disease of great concern in wheat (Triticum aestivum). Due to its relatively narrow susceptible phase and environmental dependence, the pathosystem is suitable for modeling. In the present work, a mechanistic model for estimating an infection index of FHB was developed. The model is process-based driven by rates, rules and coefficients for estimating the dynamics of flowering, airborne inoculum density and infection frequency. The latter is a function of temperature during an infection event (IE), which is defined based on a combination of daily records of precipitation and mean relative humidity. The daily infection index is the product of the daily proportion of susceptible tissue available, infection frequency and spore cloud density. The model was evaluated with an independent dataset of epidemics recorded in experimental plots (five years and three planting dates) at Passo Fundo, Brazil. Four models that use different factors were tested, and results showed all were able to explain variation for disease incidence and severity. A model that uses a correction factor for extending host susceptibility and daily spore cloud density to account for post-flowering infections was the most accurate explaining 93% of the variation in disease severity and 69% of disease incidence according to regression analysis.

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“…SISALERT is a system created to predict FHB epidemics based on the interpolation of climatic indices from a network of weather stations in southern Brazil and generating risk maps of the disease occurrence. Thus, it allows farmers preventively spray their fields with fungicides, increasing the efficiency of the chemical control (Del Ponte et al, 2004). Despite the fact that three applications of fungicides were performed in the experiment, DON was detected in 97.23% of samples, ranging from 200 to 4140 μg kg -1 (Figure 3).…”

Section: Resultsmentioning

confidence: 99%

Monitoring levels of deoxynivalenol in wheat flour of Brazilian varieties

Silva

Benin

Rosa

et al. 2015

Chilean J. Agric. Res.

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Deoxynivalenol (DON) is a mycotoxin produced by Fusarium graminearum and its intake represents a severe risk to human and animal health. The objective of this study was to evaluate levels of DON in wheat (Triticum aestivum L.) flour from two representative locations of south Brazil. Experiments were carried out in Pato Branco (Paraná) and Coxilha (Rio Grande do Sul) in a randomized complete block design with three replicates. Levels of DON were measured by highperformance liquid chromatography coupled with mass spectrometry (HPLC-MS/MS). This mycotoxin was detected in 97% of samples, ranging from 200 to 4140 μg kg -1 . Only 17% of samples presented DON beyond of the maximum allowed by the Brazilian Health Surveillance Agency up to the year 2012; even though, Fusarium head blight (FHB) epidemics were slight low in the growing season that the study was performed. According to our knowledge, this is the first report showing genetic variability of Brazilian cultivars to DON contamination and some genotypes have potential to be exploited as a source of low accumulation of this toxin.

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Giberela do trigo: aspectos epidemiológicos e modelos de previsão

Cited by 20 publications

References 47 publications

Controle da ferrugem da folha do trigo (Puccinia triticina) em diferentes momentos de aplicação de fungicida

Controle da ferrugem da folha do trigo (Puccinia triticina) em diferentes momentos de aplicação de fungicida

A risk infection simulation model for fusarium head blight of wheat

Monitoring levels of deoxynivalenol in wheat flour of Brazilian varieties

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