Consulta: creatorFacets:"Del Ponte,Emerson M."
Registros recuperados: 4
Data/hora: 09/06/2024 06:15:13

A risk infection simulation model for fusarium head blight of wheat
Provedor de dados: 102
Autores: Del Ponte,Emerson M.; Fernandes,José Maurício C.; Pavan,Willingthon.
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...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Fusarium graminearum; Plant disease modeling; Disease forecast.
Ano: 2005
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-41582005000600011

Factors affecting density of airborne Gibberella zeae inoculum
Provedor de dados: 102
Autores: Del Ponte,Emerson M.; Fernandes,José Maurício C.; Pierobom,Carlos R.
Fusarium head blight (FHB) is a disease of increasing concern in the production of wheat (Triticum aestivum). This work studied some of the factors affecting the density of airborne Gibberella zeae inoculum. Spore samplers were placed at the edge of a field in order to observe spore deposition over a period of 45 days and nights in September and October, the period that coincides with wheat flowering. Gibberella zeae colonies were counted for each period and values transformed to relative density. A stepwise regression procedure was used to identify weather variables helpful in predicting spore cloud density. In general, a predominant night-time spore deposition was observed. Precipitation and daily mean relative humidity over 90% were the factors most...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Fusarium graminearum; Aerobiology; Spore dispersal; Epidemiology.
Ano: 2005
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-41582005000100009

Models and applications for risk assessment and prediction of Asian soybean rust epidemics
Provedor de dados: 102
Autores: Del Ponte,Emerson M.; Godoy,Cláudia V.; Canteri,Marcelo G.; Reis,Erlei M.; Yang,X.B.
Asian rust of soybean [Glycine max (L.) Merril] is one of the most important fungal diseases of this crop worldwide. The recent introduction of Phakopsora pachyrhizi Syd. &amp;amp; P. Syd in the Americas represents a major threat to soybean production in the main growing regions, and significant losses have already been reported. P. pachyrhizi is extremely aggressive under favorable weather conditions, causing rapid plant defoliation. Epidemiological studies, under both controlled and natural environmental conditions, have been done for several decades with the aim of elucidating factors that affect the disease cycle as a basis for disease modeling. The recent spread of Asian soybean rust to major production regions in the world has promoted new...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Phakopsora pachyrhizi; Disease forecasting; Disease simulation models; Fungal aerobiology.
Ano: 2006
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-41582006000600001

Giberela do trigo: aspectos epidemiológicos e modelos de previsão
Provedor de dados: 102
Autores: Del Ponte,Emerson M.; Fernandes,J. Maurício C.; Pierobom,Carlos R.; Bergstrom,Gary C.
A giberela ou fusariose da espiga é, atualmente, uma das mais importantes doenças da cultura do trigo (Triticum aestivum). Epidemias severas têm sido observadas nos últimos anos em diversas regiões do mundo, promovendo perdas na produtividade e na qualidade dos grãos. No Brasil, a giberela alcançou o status de principal doença nas regiões tritícolas, principalmente no Sul do Brasil. A sua natureza esporádica está associada à dependência climática, sendo as mais severas epidemias observadas em anos com maior freqüência de chuvas, durante a fase de florescimento e enchimento de grãos. Poucas são as cultivares com resistência genética aceitável e essas normalmente falham em anos muito favoráveis a epidemias. Medidas de controle com fungicidas têm sido...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Fusarium graminearum; Simulação de epidemias; Modelos de risco; Distribuição espacial; Aerobiologia; Gibberella zeae.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-41582004000600001