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| Godoy,Cláudia V.; Koga,Lucimara J.; Canteri,Marcelo G.. |
| A diagrammatic scale to assess soybean (Glycine max) rust severity, caused by the fungus Phakopsora pachyrhizi, was developed in this study. Leaflets showing different severity levels were collected for determination of the minimum and maximum severity limits; intermediate levels were determined according to "Weber-Fechner's stimulus-response law". The proposed scale showed the levels of 0.6; 2; 7; 18; 42, and 78.5%. Scale validation was performed by eight raters (four inexperienced and four experienced), who estimated the severity of 44 soybean leaflets showing rust symptoms, with and without the use of the scale. Except for rater number eight, all showed a tendency to overestimate severity without the aid of the diagrammatic scale. With the scale, the... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Disease assessment; Glycine max; Phakopsora pachyrhizi. |
| Ano: 2006 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-41582006000100011 |
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| Godoy,Cláudia V.; Amorim,Lílian; Bergamin Filho,Armando; Silva,Herbert P.; Silva,Willian J.; Berger,Richard D.. |
| 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,... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Temporal analysis of epidemics; Staggered plantings; Puccinia polysora. |
| Ano: 2003 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-41582003000300008 |
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| Oliveira,Ana C. B. de; Godoy,Cláudia V.; Martins,Mônica C.. |
| A utilização de tolerância como forma de controle da ferrugem da soja (Glycine max), causada pelo fungo Phakopsora pachyrhizi, pode ser uma alternativa viável, visto que a resistência qualitativa tem-se mostrado instável, em função da variabilidade do fungo. Este trabalho foi realizado na região oeste da Bahia, na safra 2003/04, com objetivo de avaliar a tolerância das principais cultivares de soja utilizadas na região. Foram avaliadas quatro cultivares de ciclo precoce [MG/BR 46 (Conquista), Emgopa 315, BRS Corisco e M-SOY 8411] e quatro cultivares de ciclo tardio (BRS Barreiras, M-SOY 9350, FT 106 e BRS Sambaíba). A tolerância foi quantificada pela diferença de produtividade entre subparcelas tratadas e não tratadas com fungicida. As cultivares MG/BR 46... |
| Tipo: Info:eu-repo/semantics/other |
Palavras-chave: Resistência; Controle; Glycine max. |
| Ano: 2005 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-41582005000600016 |
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