Data/hora: 16/06/2024 11:27:08

Provedor de dados: | 102
País: | Brazil
Título: | A risk infection simulation model for fusarium head blight of wheat
Autores: | Del Ponte,Emerson M.; Fernandes,José Maurício C.; Pavan,Willingthon.
Data: | 2005-12-01
Ano: | 2005
Palavras-chave: | Fusarium graminearum; Plant disease modeling; Disease forecast.
Resumo: | 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.
Tipo: | Info:eu-repo/semantics/article
Idioma: | Inglês
Identificador: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-41582005000600011
Editor: | Sociedade Brasileira de Fitopatologia
Relação: | 10.1590/S0100-41582005000600011
Formato: | text/html
Fonte: | Fitopatologia Brasileira  v.30 n.6 2005
Fonte: | info:eu-repo/semantics/openAccess