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Registro Completo |
Biblioteca(s): |
Embrapa Arroz e Feijão. |
Data corrente: |
28/02/2008 |
Data da última atualização: |
05/03/2024 |
Tipo da produção científica: |
Artigo em Periódico Indexado |
Autoria: |
ALLORENT, D.; WILLOCQUET, L.; SARTORATO, A.; SAVARY, S. |
Afiliação: |
DELPHINE ALLORENT, IRD-CBGP; LAETITIA WILLOCQUET, INRA; ALOISIO SARTORATO, CNPAF; SERGE SAVARY, INRA. |
Título: |
Quantifying and modelling the mobilisation of inoculum from diseased leaves and infected defoliated tissues in epidemics of angular leaf spot of bean. |
Ano de publicação: |
2005 |
Fonte/Imprenta: |
European Journal of Plant Pathology, v. 113, n. 4, p. 377-394, Dec. 2005. |
Idioma: |
Inglês |
Conteúdo: |
Daily multiplication factor (number of daughter lesions per mother lesion per day) values were experimentally measured in four replications of a monocyclic experiment on angular leaf spot (ALS) of bean, where sources of inoculum were artificially established within a bean canopy, on the ground (defoliated infected leaves), or both. Daily multiplication factor of lesions in the canopy (DMFRc) was higher than that of infectious, defoliated tissues (DMFRd) in all replications. Both DMFRc and DMFRd were strongly reduced under dry compared to rainy conditions. Under rainy conditions for spore dispersal DMFRd was about two to three times smaller than DMFRc. Defoliated leaves may nevertheless represent a significant source of infection, depending on the amount of infectious tissues. Mother lesions within the canopy generated more daughter lesions in the medium (or lower) layers of the canopy than at its upper level (DMFRc higher at the medium and lower layers of a canopy), whereas DMFRd values seemed to decrease with height in the canopy. A mechanistic simulation model that combines host growth and disease-induced defoliation was designed to simulate the respective contributions of the two components of the dual inoculum source of a diseased canopy (infected foliage and defoliated infectious tissues), and varying infectious periods in both sources. Simulations suggest that higher DMFRc values have a large polycyclic effect on epidemics whereas that of DMFRd is small, and that large effects of the infectious period of lesions in the canopy are found when DMFRc is high. Simulations using experimentally measured DMFRc and DMFRd values indicated much stronger epidemics in rainy compared to dry conditions for spore dispersal, but disease persistence in the latter. The implications of considering a dual source of inoculum in the course of a polycyclic process are discussed with respect to epidemic thresholds. MenosDaily multiplication factor (number of daughter lesions per mother lesion per day) values were experimentally measured in four replications of a monocyclic experiment on angular leaf spot (ALS) of bean, where sources of inoculum were artificially established within a bean canopy, on the ground (defoliated infected leaves), or both. Daily multiplication factor of lesions in the canopy (DMFRc) was higher than that of infectious, defoliated tissues (DMFRd) in all replications. Both DMFRc and DMFRd were strongly reduced under dry compared to rainy conditions. Under rainy conditions for spore dispersal DMFRd was about two to three times smaller than DMFRc. Defoliated leaves may nevertheless represent a significant source of infection, depending on the amount of infectious tissues. Mother lesions within the canopy generated more daughter lesions in the medium (or lower) layers of the canopy than at its upper level (DMFRc higher at the medium and lower layers of a canopy), whereas DMFRd values seemed to decrease with height in the canopy. A mechanistic simulation model that combines host growth and disease-induced defoliation was designed to simulate the respective contributions of the two components of the dual inoculum source of a diseased canopy (infected foliage and defoliated infectious tissues), and varying infectious periods in both sources. Simulations suggest that higher DMFRc values have a large polycyclic effect on epidemics whereas that of DMFRd is small, and that large... Mostrar Tudo |
Thesagro: |
Doença de Planta; Feijão; Mancha Angular; Phaseolus Vulgaris. |
Thesaurus Nal: |
Phaeoisariopsis griseola. |
Categoria do assunto: |
H Saúde e Patologia |
Marc: |
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Esconder MarcMostrar Marc Completo |
Registro original: |
Embrapa Arroz e Feijão (CNPAF) |
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4. |  | DABÉSS, M. N.; GONÇALVES, D. L.; CUSTÓDIO, I. G.; PADRÃO, V. A.; KARAM, D.; SILVA, A. F. da. Avaliação do efeito de diferentes concentrações do herbicida 2,4-D no solo sobre as cultivares de milho BRS 1040 e 2B587RR. In: SEMINÁRIO DE INICIAÇÃO CIENTÍFICA PIBIC/CNPq, 13., 2018, Sete Lagoas. [Trabalhos apresentados]. Sete Lagoas: Embrapa Milho e Sorgo, 2018.Tipo: Artigo em Anais de Congresso |
Biblioteca(s): Embrapa Milho e Sorgo. |
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5. |  | DABÉSS, M. N.; PARRELLA, N. N. L. D.; SILVA, J. R. O.; KARAM, D.; BORGHI, E.; MAGALHAES, P. C. Efeito da simulação por dano mecânico em plantas de milho. In: SEMINÁRIO NACIONAL DE MILHO SAFRINHA, 16., 2021, Assis. Três décadas de inovações: avanços e desafios: anais. Sete Lagoas: Associação Brasileira de Milho e Sorgo, 2021. p. 3-4.Tipo: Artigo em Anais de Congresso |
Biblioteca(s): Embrapa Milho e Sorgo. |
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6. |  | PADRÃO, V. A.; SILVA, A. F. da; GONÇALVES, D. L.; SALES, I. da C.; DABÉSS, M. N.; KARAM, D. Eficácia de herbicidas no controle da comunidade infestante na cultura do milho. In: CONGRESSO NACIONAL DE MILHO E SORGO, 32., 2018, Lavras. Soluções integradas para os sistemas de produção de milho e sorgo no Brasil: resumos. Sete Lagoas: Associação Brasileira de Milho e Sorgo, 2018. p. 342.Tipo: Resumo em Anais de Congresso |
Biblioteca(s): Embrapa Milho e Sorgo. |
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7. |  | VASCONCELOS, G. M. P. de V. e; BERTOLINO, K. M.; CUSTÓDIO, I. G.; SALES, I. da C.; PADRÃO, V. A.; GONÇALVES, D. L.; DABÉSS, M. N.; KARAM, D. Interferência de Crotalaria spectabilis e Urochloa brizantha cv. Marandu em diferentes proporções na cultura do milho. In: CONGRESSO NACIONAL DE MILHO E SORGO, 32., 2018, Lavras. Soluções integradas para os sistemas de produção de milho e sorgo no Brasil: resumos. Sete Lagoas: Associação Brasileira de Milho e Sorgo, 2018. p. 408.Tipo: Resumo em Anais de Congresso |
Biblioteca(s): Embrapa Milho e Sorgo. |
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Registros recuperados : 7 | |
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