Please use this identifier to cite or link to this item:
metadata.artigo.dc.title: Diagrammatic scale for blister spot in leaves of coffee tree
metadata.artigo.dc.creator: Freitas, Marcelo Loran de Oliveira
Pozza, Edson Ampélio
Belan, Leônidas Leoni
Silva, Jhonata Lemos da
Abreu, Mario Sobral de
metadata.artigo.dc.subject: Coffee – Diseases and pests
Coffee – Blister spot
Phytopathogenic fungi
Café – Doenças e pragas
Café – Mancha manteigosa
Fungos fitopatogênicos
Coffea arabica
Colletotrichum gloeosporioides
metadata.artigo.dc.publisher: Academic Journals 7-May-2015
metadata.artigo.dc.identifier.citation: FREITAS, M. L. de O. Diagrammatic scale for blister spot in leaves of coffee tree. African Journal of Agricultural Research, [S. l.], v. 10, n. 19, p. 2068-2075, May 2015.
metadata.artigo.dc.description.abstract: Blister Spot is a disease transmitted through seeds. This characteristic of the disease reveals the studies of severity can offer more replies than the studies of incidence. Due to the inexistence of standardized for visual quantification of the Blister Spot’s severity, the aim of this work was to build up and validate a diagrammatic scale for evaluating the severity of Blister Spot in coffee tree. Leaves in the field were collected with different intensities of symptoms disease, and electronically determined the real severity. Based on the frequency distribution of the severity values, and according to the law of visual stimulus of Weber-Fechner, the maximum and minimum limits, and the intermediate levels of the scale were defined. The validation was realized by eight evaluators that estimated the severity in 50 leaves with different intensities of symptoms. An evaluation without the aid of the diagrammatic scale was realized, and two others with its use, having intervals of seven days. The accuracy, precision, repeatability and reproducibility of the estimate were evaluated. The developed scale shows seven 0 (0%), 1 (0.1-3%), 2 (3.1-6%), 3 (6.1-12%), 4 (12.1-25%) and5 (≥25.1%). Using the scale proposed, the evaluators presented better levels of accurancy, precision, reproducibility and repeatability in the estimate, once compared to the evaluators who did not use the diagrammatic scale. The diagrammatic scale was adjusted to aid in the visual estimate of the severity of the Blister Spot in coffee leaves.
metadata.artigo.dc.language: en_US
Appears in Collections:DFP - Artigos publicados em periódicos

Files in This Item:
File Description SizeFormat 
ARTIGO_Diagrammatic scale for blister spot in leaves of coffee tree.pdf605,52 kBAdobe PDFView/Open

This item is licensed under a Creative Commons License Creative Commons