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

Librelon, Samira Santiago; Souza, Elaine Aparecida de; Pereira, Rucyan Walace; Pozza, Edson Ampélio; Abreu, Ângela de Fátima Barbosa

doi:10.1007/s13313-015-0360-9

Cited by 18 publications

(23 citation statements)

References 18 publications

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“…As for the evaluated hypotheses for the intercept (b 0 ) and the slope (b 1 ), they had more rejections in leaves and calyces when the scales were not used (Tables 1 and 2), similar results have been obtained by other authors Librelon et al, 2015). In the first evaluation with scale in leaves, two slope values were different from 1.…”

Section: Discussionsupporting

confidence: 78%

“…Respecto a las hipótesis evaluadas para el intercepto (b 0 ) y la pendiente (b 1 ), se observaron más rechazos en hojas y cálices cuando no se utilizaron las escalas (Cuadros 1 y 2); otros autores han obtenido resultados similares Librelon et al, 2015). En la primera evaluación en hojas con el uso de la escala, dos valores de la pendiente fueron diferentes de 1.…”

Section: Discussionunclassified

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Escalas logarítmicas diagramáticas para evaluar la severidad del manchado de hojas y cálices de jamaica

Ortega-Acosta

Velasco-Cruz

HernÃ¡ndez-Morales

et al. 2016

RMF

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Spotted leaves and calyces of roselle (Hibiscus sabdariffa L.) induced by Corynespora cassiicola, is currently considered the main disease for this crop in Mexico. Given its importance, it is necessary to have a standardized method to quantify the disease severity. Therefore, the objective of this study was to develop and validate two diagrammatic logarithmic scales to quantify the severity of this disease. Naturally infected roselle leaves and calyces were collected in Guerrero state commercial plantations, and the actual severity of each of these organs was assessed. The proposed scales, designed from 2LOG program, comprised six classes in RESUMENEl manchado de hojas y cálices en jamaica (Hibiscus sabdariffa L.), inducido por Corynespora cassiicola, actualmente es considerada la principal enfermedad de este cultivo en México. Dada su importancia, es necesario contar con un método estandarizado para cuantificar la severidad de la enfermedad. Por lo anterior, el objetivo del presente estudio consistió en desarrollar y validar dos escalas logarítmicas diagramáticas para cuantificar ésta enfermedad. Para ello, se colectaron hojas y cálices de jamaica infectados de manera natural en plantaciones comerciales del estado de Guerrero, y se calculó la severidad real de cada uno de éstos órganos. Las escalas propuestas, diseñadas con el programa 2LOG, comprenden seis clases, en ho-

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Section: Discussionsupporting

confidence: 78%

Section: Discussionunclassified

Escalas logarítmicas diagramáticas para evaluar la severidad del manchado de hojas y cálices de jamaica

Ortega-Acosta

Velasco-Cruz

HernÃ¡ndez-Morales

et al. 2016

RMF

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“…Early evaluation of common bean plants, or V2 stage, has been proposed to evaluate simultaneously a large number of genotypes in germoplasm banks (Pereira et al, 2011;Librelon et al, 2015;Pádua et al, 2016). Many progenies are evaluated especially in early stages of breeding programs and plants evaluation in V3 stage is unfeasible.…”

Section: Introductionmentioning

confidence: 99%

Phenotyping for angular leaf spot severity and its implication in breeding common bean for resistance

Pereira

Abreu

Nalin

et al. 2019

Sci. agric. (Piracicaba, Braz.)

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Phenotyping for severity of angular leaf spot (ALS) in common bean is important to identify new sources of resistance and select progenies in conventional and molecular markerassisted breeding. In this study, three phenotyping methods for ALS severity were assessed and its implications in breeding for resistance to Pseudocercospora griseola are discussed. Reaction of 144 common bean lines to P. griseola was evaluated. Three different experiments were conducted in the greenhouse (V2 and V3 stages) and in the field. Common bean lines were inoculated with a mixture of spores of pathogen races 63-63 and 63-23. We observed that 31 %, 7 % and 10 % of lines were resistant in stages V2, V3 and in the field, respectively. Estimates of coincidence index V2-V3, V2-field and V3-field were 68 %, 69 % and 88 %, respectively. Evaluations in V3 stage and in the field were the phenotyping methods more efficient for ALS severity. However, evaluation in V3 stage is impracticable to assess routinely many genotypes in breeding programs. Evaluation in V2 stage may be used to carry out a first screening, especially in the early stages of breeding programs. Moreover, this methodology may be used in association with evaluation of plants in the field to increase genetic gain.

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“…On the other hand, diagrammatic scales or standard area diagram sets (SADs) not only improve the accuracy and the precision of disease evaluations, but also demonstrate significant improvements in the visual estimates of severity (Damasceno et al, 2014;De Paula et al, 2016;Santos et al, 2017). Thus, they are valuable tools in breeding programs, whose success is achieved depending on the exact and accurate use of quantification methods of disease severity and selection of resistant materials (Librelon et al, 2015).…”

Section: Introductionmentioning

confidence: 99%

Standard area diagram set for quantification of septoriosis in fruit of sour passion fruit

Costa¹,

Peixoto²,

Blum³

et al. 2019

Agraria

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A standard area diagram set (SADs) for severity evaluation of septoriosis (Septoria passiflorae) in fruit of sour passion fruit (Passiflora edulis Sims) was developed and validated in this study. The SADs presented eight severity levels (0.3; 0.5; 1; 2; 4; 10; 18; and 30%). For its validation, 20 raters were divided into groups (G1 and G3, inexperienced; G2 and G4, experienced) who initially estimated the disease severity without the aid of the SADs. Subsequently, G1 and G2 performed the second evaluation without the SADs, and G3 and G4 completed the second evaluation with the proposed SADs for each disease. The accuracy and precision of the evaluations were determined by simple linear regression and by Lin's concordance correlation coefficient. The proposed SADs allowed accurate and precise quantification of septoriosis severity, increasing the agreement between estimated and actual values. The increase in accuracy and precision in the non-aided groups, when present, was less pronounced than those increments observed in the SADs-aided groups. Lin's concordance correlation coefficient confirmed the increases in accuracy and precision detected by the linear regression analysis.Escala diagramática para a quantificação da severidade da septoriose em frutos do maracujazeiro azedo RESUMO: Uma escala diagramática para a avaliação da severidade da septoriose (Septoria passiflorae) em frutos do maracujazeiro azedo (Passiflora edulis Sims) foi desenvolvida e validada neste estudo. A escala diagramática apresentou oito níveis de severidade (0,3; 0,5; 1; 2; 4; 10; 18; e 30%). Para a sua validação, os 20 avaliadores foram divididos em grupos (G1 e G3, sem experiência; G2 e G4, com experiência), que inicialmente estimaram a severidade da doença sem auxílio da escala. Posteriormente, G1 e G2 fizeram outra avaliação sem escala, e G3 e G4 realizaram a avaliação com a escala proposta. A acurácia e a precisão das estimativas foram determinadas por regressão linear simples e pelo coeficiente de correlação de concordância de Lin. A escala diagramática proposta permitiu quantificar a severidade da septoriose de forma acurada e precisa, aumentando a concordância entre os valores estimados e os reais. O aumento da acurácia e precisão nos grupos que realizaram dupla avaliação sem escala, quando ocorreu, foi mais discreto que os incrementos observados nos grupos que utilizaram a escala. A análise de concordância de Lin confirmou os incrementos da acurácia e precisão detectados pela análise de regressão linear. Palavras-chave: frutos; Passiflora edulis Sims; fitopatometria; Septoria passifloraeStandard area diagram set for quantification of septoriosis in fruit of sour passion fruit Rev. Bras.

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

Cited by 18 publications

References 18 publications

Escalas logarítmicas diagramáticas para evaluar la severidad del manchado de hojas y cálices de jamaica

Escalas logarítmicas diagramáticas para evaluar la severidad del manchado de hojas y cálices de jamaica

Phenotyping for angular leaf spot severity and its implication in breeding common bean for resistance

Standard area diagram set for quantification of septoriosis in fruit of sour passion fruit

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