Data/hora: 11/06/2024 09:43:08

Biblioteca(s): | Embrapa Soja.
Data corrente: | 11/05/2006
Data da última atualização: | 13/12/2011
Autoria: | GODOY, C. V.; KOGA, L. J.; CANTERI, M. G.
Título: | Diagrammatic scale for assessment of soybean rust severity.
Ano de publicação: | 2006
Fonte/Imprenta: | Fitopatologia Brasileira, Brasília, v. 31, n. 1, p. 63-68, jan./fev. 2006.
Idioma: | Inglês
Conteúdo: | 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 raters obtained better accuracy and precision levels, although the tendency to overestimate was maintained. Experienced raters were more accurate and precise than inexperienced raters, and assessment improvements with the use of the scale were more significant for inexperienced raters.
Palavras-Chave: | Diagrammatic.
Categoria do assunto: | --
URL: | http://ainfo.cnptia.embrapa.br/digital/bitstream/item/50145/1/26172.pdf
Registro original: | Embrapa Soja (CNPSO)
Exemplares: | CNPSO - (26172-1) - UPC - AP - -- -  -  -  - DIS