Elaboração e validação de escalas diagramáticas para avaliação da severidade da mancha-bacteriana do feijão - caupi em cultivares com trifólios morfologicamente distintos

Lima, Hyanameyka de Departamento de Fitopatologia Evangelista; Nechet, K. de L.; Halfeld-Vieira, B. de A.; Oliveira, José de Departamento de Fitopatologia Rogério; Duarte, Henrique da Silva Silveira; Queiroz, Ezequiel de Souza; Oliveira, Francidalva de Lima

doi:10.1590/s0103-84782013001000001

Cited by 9 publications

(5 citation statements)

References 11 publications

(8 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…With the scale five evaluators were outside the range of -10 to 10, two of them (15.38% of the total evaluators) with errors between 15 and 20%, similar results were found in previous studies (SANTOS et al, 2017;TROJAN et al, 2018;LORENZETTI et al, 2019). Therefore, eight evaluators can be considered good in the assessment of the disease when using the scale (LIMA et al, 2013;NUÑEZ et al, 2017). These results showed a decrease of absolute errors, indicating high precision.…”

Section: Discussionsupporting

confidence: 87%

“…Regarding the t-test for the values of the intercept (a), the null hypothesis was rejected in more cases when the scale was not used, with the scale accepted values increased in a 20%. R 2 values improved when the scale was used, the R 2 average showed an increase of 3.16% compared with the value obtained without the scale, in both cases the evaluation of severity showed good precision, the values of R 2 were ≥0.85, considered high for this type of estimate (LIMA et al, 2013;TROJAN et al, 2018;LORENZETTI et al, 2019).…”

Section: Discussionmentioning

confidence: 84%

See 1 more Smart Citation

Diagrammatic scale for measuring severity of gray mould in thornless Castilla blackberry (Rubus glaucus Benth)

2020

View full text Add to dashboard Cite

Gray mould, caused by the fungus Botrytis cinerea Pers., is a disease that largely affects the crops of Rubus glaucus Benth. (Castilla blackberry) in Colombia. In spite of the economic losses that it causes in the production of Castilla blackberry at national level, a standardized method to quantify the disease severity caused by this fungus in the fruits has not yet been reported. In the present work, a diagrammatic scale was prepared to assess gray mould severity in thornless fruits of R. glaucus. The proposed scale showed the levels of 5, 10, 20, 40, 60, 80, and 100%. Photographic images were obtained for each of these levels, which were processed using the ImageJ software. The scale was validated by 13 evaluators who assessed affected fruits with and without the scale. The precision and accuracy of each evaluator was determined by simple linear regression between actual and estimated severity. The evaluators showed better precision, accuracy, and reproducibility in the assessments performed with the scale. The proposed scale is appropriate to estimate the severity of gray mould in R. glaucus fruits.

show abstract

Section: Discussionsupporting

confidence: 87%

Section: Discussionmentioning

confidence: 84%

Diagrammatic scale for measuring severity of gray mould in thornless Castilla blackberry (Rubus glaucus Benth)

2020

View full text Add to dashboard Cite

show abstract

“…The high severity levels reported in this study are commonly observed in yellow passion fruit orchards due to the difficult control of this disease and the susceptibility of commercial cultivars to this bacterium (ISHIDA; HALFELD-VIEIRA, 2009). To better represent the severity values identified for the bacterial spot, the SADs composed of a larger number of diagrams are frequently used in pathosystems that involve the species Xanthomonas (NASCIMENTO et al, 2005;LIMA et al, 2013;DUAN et al, 2015), as established in this study.…”

Section: Resultsmentioning

confidence: 99%

Standard area diagram set for bacterial spot assessment in fruits of yellow passion fruit

et al. 2018

View full text Add to dashboard Cite

This study developed and validated a standard area diagram set (SADs) for severity assessment of bacterial spot (Xanthomonas axonopodis pv. ) in passifloraefruits of yellow passion fruit (Passiflora edulis). The SADs consisted of eight severity levels (1%; 3%; 5%; 10%; 21%; 38%; 65%; and 80%). For its validation, 20 raters, who initially estimated the disease severity without the aid of the SADs, were divided into groups (G1 and G3, inexperienced; G2 and G4, experienced). Subsequently, G1 and G2 performed the second evaluation without the proposed SADs, and G3 and G4 completed the second evaluation using the proposed SADs. The accuracy and precision of the assessments were determined by simple linear regression and by the Lin’s concordance correlation coefficient. The increase in the accuracy was confirmed by the reduction in the constant and systematic errors, indicating that the estimated severities were close to the actual values when the SADs was used. Inexperienced raters benefited the most from the use of the SADs, and 60% and 100% of them presented constant and systematic error-free estimates, respectively. Precision increased with the increase in the coefficient of determination, the reduction in absolute errors, and the increase in the reproducibility of the estimates between pairs of raters.

show abstract

“…Based on the severity levels observed, a black and white 8diagram SADs (2; 4; 9; 18; 35; 58; 80; and 94%) was proposed (Figure 1). The number of diagrams used to represent the extent of the disease severity was similar to the number used in SADs proposed for other pathosystems involving different Xanthomonas species (BELASQUE JR. et al, 2005;NASCIMENTO et al, 2005;LIMA et al, 2013). Accuracy is defined as the exactness of a systematic error-free measure and is measured by the intercept and slope coefficient of a linear regression between actual severity and estimated severity (BERGAMIN FILHO;AMORIM, 1996).…”

Section: Resultsmentioning

confidence: 99%

Development and validation of a standard area diagram set as assessment aid for estimating the severity of bacterial spot on tri-lobed leaves of yellow passion fruit

et al. 2019

View full text Add to dashboard Cite

Bacterial spot (Xanthomonas axonopodis pv. passiflorae) significantly reduces yellow passion fruit (Passiflora edulis Sims) yield and longevity. A standard area diagram set (SADs) for severity assessment of bacterial spot on tri-lobed leaves of yellow passion was developed and validated in this study. The SADs consisted of eight severity levels (2; 4; 9; 18; 35; 58; 80; and 94%). For its validation, 20 raters, who initially estimated the disease severity without the aid of the SADs, were divided into four groups (G1 and G3, inexperienced; G2 and G4, experienced). Subsequently, G1 and G2 performed the second evaluation without the SADs, and G3 and G4 completed the second evaluation with the proposed SADs. The accuracy and precision of the assessments were determined by simple linear regression and by the Lin’s concordance correlation coefficient (LCCC). The proposed SADs allowed accurate and precise quantification of bacterial spot severity, increasing the agreement between estimated and actual values. Inexperienced raters benefited the most from the use of the SADs. 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. The LCCC confirmed the increases in accuracy and precision detected by the linear regression analysis.

show abstract

Elaboração e validação de escalas diagramáticas para avaliação da severidade da mancha-bacteriana do feijão - caupi em cultivares com trifólios morfologicamente distintos

Cited by 9 publications

References 11 publications

Diagrammatic scale for measuring severity of gray mould in thornless Castilla blackberry (Rubus glaucus Benth)

Diagrammatic scale for measuring severity of gray mould in thornless Castilla blackberry (Rubus glaucus Benth)

Standard area diagram set for bacterial spot assessment in fruits of yellow passion fruit

Development and validation of a standard area diagram set as assessment aid for estimating the severity of bacterial spot on tri-lobed leaves of yellow passion fruit

Contact Info

Product

Resources

About