Tropical Plant Pathology (2008) 33, 439-443

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Francislene Angelotti, Claudia R. Scapin, Dauri J. Tessmann, João B. Vida, Ricardo R. Oliveira and Marcelo G. Canteri (2008)
Diagrammatic scale for assessment of grapevine rust
Tropical Plant Pathology 33 (6), 439-443
Abstract: A diagrammatic scale with six levels of disease severity (1, 5, 12, 25, 50 and 75%) was developed to assess grapevine (Vitis spp.) rust severity, caused by the fungus Phakopsora euvitis. Two versions of the scale, in black-and-white and in color, were validated by seven raters without previous experience with grapevine rust, who estimated the severity of 30 grapevine leaves showing rust symptoms, with and without the use of the scales. Precision and accuracy were determined by linear regression, relating the assessments using the scales to actual severity. Actual severity was assessed with the software ASSESS®. Using the diagrammatic scales, some raters were able to improve precision and accuracy. The color scale provided slightly more precise and accurate estimates than the black-and-white scale.
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Database assignments for author(s): Dauri J. Tessmann

Research topic(s) for pests/diseases/weeds:
surveys/sampling/distribution


Pest and/or beneficial records:

Beneficial Pest/Disease/Weed Crop/Product Country Quarant.


Phakopsora euvitis Grapevine (Vitis)