Comparison and validation of diagrammatic scales for brown eye spots in coffee tree leaves

Custódio, Adriano Augusto de Paiva; Pozza, Edson Ampélio; Guimarães, Sarah da Silva Costa; Koshikumo, Érika Sayuri Maneti; Hoyos, Julián Maurício Agredo; Souza, Paulo Estevão de

doi:10.1590/s1413-70542011000600005

Cited by 31 publications

(28 citation statements)

References 5 publications

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“…Custódio et al. () and Belan et al. () also reported that without the aid of diagrammatic scales the severity of BES and bacterial blight of coffee leaves were overestimated.…”

Section: Discussionmentioning

confidence: 99%

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Diagrammatic Scales for Assessing Brown Eye Spot (Cercospora coffeicola) in Red and Yellow Coffee Cherries

Paula

Pozza

Santos

et al. 2016

Journal of Phytopathology

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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

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“…Custódio et al. () and Belan et al. () also reported that without the aid of diagrammatic scales the severity of BES and bacterial blight of coffee leaves were overestimated.…”

Section: Discussionmentioning

confidence: 99%

“…The repeatability of estimates from the same evaluator was determined by employing the coefficient of determination ( R 2 ) of linear regression between the third and second evaluations, according to Custódio et al. (), Madden et al. (), Santos et al.…”

Section: Methodsmentioning

confidence: 99%

Diagrammatic Scales for Assessing Brown Eye Spot (Cercospora coffeicola) in Red and Yellow Coffee Cherries

Paula

Pozza

Santos

et al. 2016

Journal of Phytopathology

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“…Salgado et al (2009), evaluated phoma leaf blight severity of coffee trees (Corrêa et al 2009;Lenz et al 2009Lenz et al , 2010Santos et al 2010;Correia et al 2011;Custódio et al 2011). …”

Section: Discussionmentioning

confidence: 99%

Diagrammatic scale to evaluate angular leaf spot severity in primary leaves of common bean

Librelon

Souza

Pereira

et al. 2015

Australasian Plant Pathol.

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The aim of this study was to develop a diagrammatic scale to evaluate angular leaf spot (ALS) severity in primary leaves of common bean. A diagrammatic scale was developed and validated with nine levels of severity: 0 %; 0.1 to 0.5 %; 0.6 to 4.0 %; 4.1 to 7.0 %; 7.1 to 16 %; 16.1 to 26 %; 26.1 to 32 %; 32.1 to 38 % and 38.1 to 60 %. The use of this scale, associated with the early inoculation method, allowed rating of ALS severity in common bean leaves in the V2 stage of development that is, when the primary leaves are fully open. Validation of the scale was performed by 14 Evaluators. These Evaluators estimated the severity in 40 common bean leaves with different levels of severity, previously measured by the software Quant®. The accuracy and precision of each Evaluator were determined by simple linear regression, by comparing between actual severity, measured electronically, and that estimated by the Evaluator. Without the scale, most of the Evaluators overestimated the severity of the disease. With the scale, the Evaluators obtained better levels of accuracy and precision, with absolute errors less than 5 %. The diagrammatic scale proposed proved to be adequate for early performance of the pathogenicity test.

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“…The assessment of CLR severity was done according to the diagrammatic scale proposed by Cunha, Pozza, Dias, and Barretti (2001) and BYS by Custódio et al (2011). The third or fourth pairs of leaves were evaluated in each stem every 15 days, in a total of five evaluations.…”

Section: Assessment Of Disease Severitymentioning

confidence: 99%

Resistance inducers applied alone or in association with fungicide for the management of leaf rust and brown eye spot of coffee under field conditions

Silva

Resende

Monteiro

et al. 2019

Journal of Phytopathology

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The use of resistance inducers is a promising development in the management of plant diseases, owing to their ability to control a broad spectrum of pathogens and improve the efficacy of fungicides. This study evaluates different sources of phosphonates (potassium, manganese, copper), a formulation prepared from the by‐products of the coffee industry (Greenforce CuCa), as well as the effects of their application, alone or in association with fungicide, in the management of two important coffee fungal diseases in Brazil: leaf rust and brown eye spot, caused by Hemileia vastatrix and Cercospora coffeicola, respectively. The effect of these products on defoliation, productivity and chemical composition of coffee beans (content of trigonelline, chlorogenic acid, caffeine and total soluble solids) was evaluated. Among all the alternative products tested individually, potassium phosphonate (P2O5—33.6% + K2O—29%) stood out, particularly for rust control, which was similar to the results of fungicide treatments. Treatments with fungicide, Greenforce CuCa and cuprous oxide, individually, caused less plant defoliation. Regarding the chemical composition of the coffee beans, the manganese phosphonate treatment showed the highest values for trigonelline, chlorogenic acid, caffeine and total soluble solid content. The results of this study show that resistance inducers can be useful in disease management, may come to eventually replace traditional fungicides and can also contribute to the beverage quality.

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Comparison and validation of diagrammatic scales for brown eye spots in coffee tree leaves

Cited by 31 publications

References 5 publications

Diagrammatic Scales for Assessing Brown Eye Spot (Cercospora coffeicola) in Red and Yellow Coffee Cherries

Diagrammatic Scales for Assessing Brown Eye Spot (Cercospora coffeicola) in Red and Yellow Coffee Cherries

Diagrammatic scale to evaluate angular leaf spot severity in primary leaves of common bean

Resistance inducers applied alone or in association with fungicide for the management of leaf rust and brown eye spot of coffee under field conditions

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