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Biblioteca(s): |
Embrapa Soja. |
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Data corrente: |
25/01/2006 |
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Data da última atualização: |
25/01/2006 |
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Autoria: |
GODOY, C. V.; AMORIM, L.; BERGAMIN FILHO, A.; SILVA, H. P.; SILVA, W. J.; BERGER, R. D. |
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Título: |
Temporal progress of southern rust in maize under different environmental conditions. |
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Ano de publicação: |
2003 |
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Fonte/Imprenta: |
Fitopatologia Brasileira, Brasília, DF, v. 28, n. 3, p. 273-278, maio/jun. 2003. |
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Idioma: |
Inglês |
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Conteúdo: |
The progress of the severity of southern rust in maize (Zea mays) caused by Puccinia polysora was quantified in staggered plantings in different geographical areas in Brazil, from October to May, over two years (1995-1996 and 1996-1997). The logistic model, fitted to the data, better described the disease progress curves than the Gompertz model. Four components of the disease progress curves (maximum disease severity; area under the disease progress curve, AUDPC; area under the disease progress curve around the inflection point, AUDPCi; and epidemic rate) were used to compare the epidemics in different areas and at different times of planting. The AUDPC, AUDPCi, and the epidemic rate were analyzed in relation to the weather (temperature, relative humidity, hours of relative humidity >90%, and rainfall) and recorded during the trials. Disease severity reached levels greater than 30% in Piracicaba and Guaíra in the plantings between December and January. Lower values of AUDPC occurred in later plantings at both locations. The epidemic rate was positively correlated (P < 0.05) with the mean daily temperatures and negatively correlated with hours of relative humidity >90%. The AUDPC was not correlated with any weather variable. The AUDPCi was negatively related to both variables connected to humidity, but not to rain. Long periods (mostly >13 h day-1) of relative humidity >90% (that corresponded to leaf wetness) occurred in Castro. Severity of southern rust in maize has always been low in Castro, thus the negative correlations between disease and the two humidity variables. MenosThe progress of the severity of southern rust in maize (Zea mays) caused by Puccinia polysora was quantified in staggered plantings in different geographical areas in Brazil, from October to May, over two years (1995-1996 and 1996-1997). The logistic model, fitted to the data, better described the disease progress curves than the Gompertz model. Four components of the disease progress curves (maximum disease severity; area under the disease progress curve, AUDPC; area under the disease progress curve around the inflection point, AUDPCi; and epidemic rate) were used to compare the epidemics in different areas and at different times of planting. The AUDPC, AUDPCi, and the epidemic rate were analyzed in relation to the weather (temperature, relative humidity, hours of relative humidity >90%, and rainfall) and recorded during the trials. Disease severity reached levels greater than 30% in Piracicaba and Guaíra in the plantings between December and January. Lower values of AUDPC occurred in later plantings at both locations. The epidemic rate was positively correlated (P < 0.05) with the mean daily temperatures and negatively correlated with hours of relative humidity >90%. The AUDPC was not correlated with any weather variable. The AUDPCi was negatively related to both variables connected to humidity, but not to rain. Long periods (mostly >13 h day-1) of relative humidity >90% (that corresponded to leaf wetness) occurred in Castro. Severity of southern rust in maize has always b... Mostrar Tudo |
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Categoria do assunto: |
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Marc: |
LEADER 02146naa a2200181 a 4500
001 1468885
005 2006-01-25
008 2003 bl uuuu u00u1 u #d
100 1 $aGODOY, C. V.
245 $aTemporal progress of southern rust in maize under different environmental conditions.
260 $c2003
520 $aThe progress of the severity of southern rust in maize (Zea mays) caused by Puccinia polysora was quantified in staggered plantings in different geographical areas in Brazil, from October to May, over two years (1995-1996 and 1996-1997). The logistic model, fitted to the data, better described the disease progress curves than the Gompertz model. Four components of the disease progress curves (maximum disease severity; area under the disease progress curve, AUDPC; area under the disease progress curve around the inflection point, AUDPCi; and epidemic rate) were used to compare the epidemics in different areas and at different times of planting. The AUDPC, AUDPCi, and the epidemic rate were analyzed in relation to the weather (temperature, relative humidity, hours of relative humidity >90%, and rainfall) and recorded during the trials. Disease severity reached levels greater than 30% in Piracicaba and Guaíra in the plantings between December and January. Lower values of AUDPC occurred in later plantings at both locations. The epidemic rate was positively correlated (P < 0.05) with the mean daily temperatures and negatively correlated with hours of relative humidity >90%. The AUDPC was not correlated with any weather variable. The AUDPCi was negatively related to both variables connected to humidity, but not to rain. Long periods (mostly >13 h day-1) of relative humidity >90% (that corresponded to leaf wetness) occurred in Castro. Severity of southern rust in maize has always been low in Castro, thus the negative correlations between disease and the two humidity variables.
700 1 $aAMORIM, L.
700 1 $aBERGAMIN FILHO, A.
700 1 $aSILVA, H. P.
700 1 $aSILVA, W. J.
700 1 $aBERGER, R. D.
773 $tFitopatologia Brasileira, Brasília, DF$gv. 28, n. 3, p. 273-278, maio/jun. 2003.
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| 3. |  | ALVES, A. C.; BRAUNER, J. L.; ZONTA, E. P.; CORDEIRO, D. S.; CORREA, L. A. V. Diagnose foliar de potassio em sorgo sacarino: selecao de orgaos e epocas para amostragem. Pesquisa Agropecuaria Brasileira, Brasilia, v.21, n.7, p.685-690, jul. 1986.| Biblioteca(s): Embrapa Unidades Centrais. |
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| 11. | | ALVES, A. C.; BRAUNER, J. L.; CORDEIRO, D. S.; ZONTA, E. P.; CORREA, L. A. V. Exigências Nutricionais em Potássio, Cálcio e Magnésio do Sorgo Sacarino. Pesquisa Agropecuária Brasileira, Brasília, v.23, n.5, p.529-536, maio 1988| Biblioteca(s): Embrapa Unidades Centrais. |
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| 12. | | HEMP, S.; CORDEIRO, D. S.; PORTO, M. P.; BRAUNER, J. L.; SILVEIRA JUNIOR, P. Efeito de diferentes parcelamentos da adubacao nitrogenada na beterraba acucareira. Pesquisa Agropecuaria Brasileira, Brasilia, v.20, n.12, p.1355-1363, dez. 1985.| Biblioteca(s): Embrapa Unidades Centrais. |
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| 13. | | BORKERT, C. M.; CORDEIRO, D. S.; SFREDO, G. J.; PALHANO, J. B.; DITTRICH, R. C. Efeito de diversas doses de fosforo de diferentes fosfatos naturais brasileiros na producao da soja, em condicoes de primeiro cultivo. In: SEMINARIO NACIONAL DE PESQUISA DE SOJA, 1., 1978, Londrina. Anais... Londrina: EMBRAPA-CNPSo, 1979. v.1 p.291-298.| Biblioteca(s): Embrapa Soja. |
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| 16. | | PALHANO, J. B.; CAMPO, R. J.; SFREDO, G. J.; BORKERT, C. M.; CORDEIRO, D. S. Efeito de niveis de calcario sobre o rendimento da soja. In: SEMINARIO NACIONAL DE PESQUISA DE SOJA, 2., 1981, Brasilia. Anais... Londrina: EMBRAPA-CNPSo, 1982. v.2 p.617-624. (EMBRAPA-CNPSo. Documentos, 1).| Biblioteca(s): Embrapa Soja. |
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| 19. | | SFREDO, G. J.; CAMPO, R. J.; PALHANO, J. B.; BORKERT, C. M.; CORDEIRO, D. S. Efeito do fosfato natural brasileiro, isolado e em mistura com fosfato solúvel,sobre o rendimento da soja. In: SEMINÁRIO NACIONAL DE PESQUISA DE SOJA, 2., 1981, Brasília. Resumos... Londrina: Embrapa-CNPSo, 1981. p. 164.| Biblioteca(s): Embrapa Soja. |
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| 20. | | SFREDO, G. J.; CAMPO, R. J.; PALHANO, J. B.; BORKERT, C. M.; CORDEIRO, D. S. Efeito de fosfato natural brasileiro, isolado e em mistura com fosfato soluvel, sobre o rendimento da soja. In: SEMINARIO NACIONAL DE PESQUISA DE SOJA, 2., 1981, Brasilia. Anais... Londrina: EMBRAPA-CNPSo, 1982. v.2 p.583-589. (EMBRAPA-CNPSo. Documentos, 1).| Biblioteca(s): Embrapa Soja. |
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| Registros recuperados : 41 | |
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