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Diagrammatic scale to assess downy mildew severity in melon
Provedor de dados: 75
Autores: Michereff,Sami J; Noronha,Marissônia A; Lima,Gaus SA; Albert,Ígor CL; Melo,Edilaine A; Gusmão,Luciana O.
The downy mildew, caused by Pseudoperonospora cubensis, is an important melon disease in Northeast Brazil. Considering the lack of standard methods for its assessment, a diagrammatic scale was developed with 2, 4, 8, 16, 32, 64, 82, and 96% of affected leaf area. The scale was then checked for its accuracy, precision, and reproducibility in estimating downy mildew severity. The diagrammatic scale was validated by eight disease raters; using 50 leaves with different severity levels, previously measured using the software Assess®. Two evaluations were performed on the same set of leaves, but in a different sequence order, by the same raters, within a 15-day interval. The accuracy and precision of each rater was determined by simple linear regression between...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cucumis melo; Pseudoperonospora cubensis; Foliar disease; Epidemiology; Phytopatometry.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-05362009000100015