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Diagrammatic Scales for Assessing Brown Eye Spot ( Cercospora coffeicola ) in Red and Yellow Coffee Cherries
Author(s) -
Azevedo de Paula Paulo V. A.,
Pozza Edson A.,
Santos Leandro A.,
Chaves Eugênio,
Maciel Matheus P.,
Paula Júlio César A.
Publication year - 2016
Publication title -
journal of phytopathology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.53
H-Index - 60
eISSN - 1439-0434
pISSN - 0931-1785
DOI - 10.1111/jph.12499
Subject(s) - berry , cercospora , diagrammatic reasoning , repeatability , biology , horticulture , cultivar , leaf spot , botany , mathematics , statistics , linguistics , philosophy
Brazil is the world's largest coffee producer. Brown eye spot ( BES ) ( Cercospora coffeicola ) is a major crop disease that can cause 15–30% production losses and decrease the coffee beverage quality. Although the influence of this disease on beverage quality has been studied, diagrammatic scales for assessment of the disease severity in berries are still unexplored. Thus, this study has developed and validated diagrammatic scales to assess the severity of BES . Two diagrammatic scales were designed to assess the disease in berries, which can be yellow or red depending on the cultivar. The scale of yellow berries had nine grades: grade 0: 0%; 1: 0.1–5.0%; 2: 5.1–10.0%; 3: 10.1–15.0%; 4: 15.1–20.0%; 5: 20.1–30.0%; 6: 30.1–40.0%; 7: 40.1–60.0%; and 8: higher than 60.0%, while the scale of red berries had eight grades: grade 0: 0%; 1: 0.1–2.5%; 2: 2.6–5.0%; 3: 5.1–10.0%; 4: 10.1–20.0%; 5: 20.1–30.0%; 6: 30.1–50.0%; and 7: higher than 50.0% severity. Using scales improved accuracy and precision with R 2 = 0.99 and provided good repeatability and reproducibility of assessments of disease severity. Both scales can be used because the different berry colour influenced the accuracy and precision between the scales.