Consulta: creatorFacets:"Fernandes,José Maurício C."
Registros recuperados: 3
Data/hora: 09/06/2024 12:02:17

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

Influência da temperatura e da umidade relativa do ar na esporulação de Magnaporthe grisea em trigo
Provedor de dados: 102
Autores: Alves,Kalíbia Jane P.; Fernandes,José Maurício C.
O fungo Magnaporthe grisea (Anamorfo Pyricularia grisea) é o agente causal da brusone do trigo (Triticum aestivum), uma doença limitante à cultura do trigo no Brasil em regiões produtoras localizadas acima do paralelo 24 °S. O objetivo do presente trabalho foi estudar o efeito da temperatura e da umidade relativa do ar na esporulação de M. grisea. O número médio de conídios foi determinado em ráquis de plantas de trigo previamente colonizados com o fungo e expostos em câmaras de crescimento sob temperaturas de 23 e 28 ºC, e com umidade relativa do ar de 80, 85, 90, 95 e 100%. A determinação do número de conídios produzidos foi feita após 24, 48, 72 e 96 horas de exposição em cada combinação de temperatura e umidade. Os efeitos da temperatura e da umidade...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Triticum aestivum; Pyricularia grisea; Fatores climáticos; Modelos preditivos.
Ano: 2006
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-41582006000600007