Validação de escala diagramática para quantificação da severidade da antracnose do colmo do milho

Nicoli, Alessandro; Costa, R. V. da; Cota, L. V.; Silva, Dagma Dionísia da; Zambolim, Laércio; Lanza, F.; Guimaraes, D. P.; Landau, Elena Charlotte

doi:10.1590/0103-8478cr20141510

Cited by 15 publications

(16 citation statements)

References 24 publications

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“…The LCCC can vary from -1 to +1, indicating maximum positive agreement when the value is 1.0 (Lin, 1989). Since its creation, this coefficient has been used to validate SADs for different diseases (Yadav et al, 2013;Nicoli et al, 2015;.…”

Section: Methodsmentioning

confidence: 99%

Standard Area Diagram Set for Bacterial Spot Quantification in Entire-Margined Leaves of Sour Passion Fruit

Costa¹,

Peixoto²,

Blum³

et al. 2019

JAS

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This study developed and validated a standard area diagram set (SADs) to aid in the estimation of bacterial spot (Xanthomonas axonopodis pv. passiflorae) severity in entire-margined leaves of sour passion fruit (Passiflora edulis Sims). The SADs consisted of eight severity levels (3; 6; 12; 25; 50; 77, and 88%). 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 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 accuracy was confirmed by the 80% constant error-free estimates (G3 and G4) and 100% (G3) and 80% (G4) systematic error-free estimates when the SADs was used. 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. Inexperienced raters benefited the most from the use of the SADs. The increase in the accuracy and precision in the non-aided groups, when present, was less pronounced than those increments observed in the SADs-aided groups. The Lin’s concordance correlation coefficient confirmed the increased accuracy and precision detected by the linear regression analysis and indicated increased agreement between the estimated and actual values of disease severity in the SADs-aided groups.

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Section: Methodsmentioning

confidence: 99%

Standard Area Diagram Set for Bacterial Spot Quantification in Entire-Margined Leaves of Sour Passion Fruit

Costa¹,

Peixoto²,

Blum³

et al. 2019

JAS

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“…Thirty days after inoculation, plants were removed from the soil and the stalks were cut lengthwise and examined for stalk rot symptoms using a diagrammatic scale. The scale was composed of eight scores, according to the percentage of the area with rot (Nicoli et al, 2015). Treatments were arranged in blocks in a randomized design with three replications.…”

Section: Morphological Characterizationmentioning

confidence: 99%

Identification and pathogenicity of Fusarium species associated with pokkah boeng of sugarcane in Brazil

et al. 2019

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Brazil is the world’s biggest producer of sugarcane (Saccharum spp. hybrids). Pokkah boeng is an important fungal disease in this crop caused by members of the Fusarium fujikuroi species complex (FFSC) and characterized by deformation of the aerial part of the plant and stem rot. While the occurrence of symptoms has been reported in plantations in Brazil, no official reports of the disease exist. In this study, species of the FFSC were identified that are associated with sugarcane plants with symptoms of pokkah boeng in Brazil. This was achieved using two‐loci molecular phylogeny, sexual compatibility and analysis of morphological markers. The ability of strains to cause disease in plants of sugarcane, maize, sorghum and millet was also evaluated. The 39 isolates studied were identified as F. sacchari, F. proliferatum and another, still unknown, phylogenetic lineage that is sister to F. andiyazi. Crossing field isolates of F. sacchari and F. proliferatum with their respective tester strains produced fertile perithecia and viable ascospores. All three species induced symptoms of pokkah boeng on inoculated sugarcane plants and caused stem rot in maize, sorghum and millet. Symptoms on sugarcane are chlorosis and necrosis of leaves, punctured lesions, twisted leaves, reduction of the total leaf area, death of the top of the plant and stalk rot. The findings confirmed the aetiology of the disease in Brazil, generated basic knowledge for the development of strategies for diagnosis and monitoring of the disease and support breeding programmes for selecting resistant germplasm.

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“…OLS images (228 pictures), of known severity, were inserted into the Disease Plan spreadsheet, which performs the randomization of images, estimate recording and agreement statistics (SACHET et al, 2016). The precision, accuracy, deviations from the ideal projection, Lin`s concordant correlation coefficient as shown by NICOLI et al (2015) and the smallest difference detectable value based on the random effect of the one-way ANOVA corresponding to the least significant difference (DMS-t com P=0.05) were evaluated. The SAD was developed with six levels: 1, 3, 6, 9, 12 and 15% (Figure 1), the last level was higher than the real maximum severity observed (13.8%), with diagrams being generated from standard leaf (edge) and lesion shapes (circles).…”

Section: Crop Protectionmentioning

confidence: 99%

Standard area diagram set for olive leaf spot assessment

et al. 2017

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The establishment of olive (Olea europaea) orchards in Brazil is increasing due to their economic potential and benefits to human health. However, a number of limiting factors need to be overcome, such as Olive Leaf Spot (OLS) occurrence, for olives to reach their full potential. OLS, which is caused by Fusicladium oleaginum, results in defoliation and a reduction in fruit production. This study aimed to develop a standard area diagram set (SAD) for the assessment of OLS severity under humid subtropical climate conditions. The SAD was developed with six levels of severity (1, 3, 6, 9, 12 and 15%) and OLS severity was validated by eight inexperienced raters. Using the SAD provided an increase in accuracy, precision and concordance, while also reducing the smallest difference detectable. The proposed SAD was adequate at estimating the OLS and could be a useful tool for use in epidemiological and phytopathometry studies, evaluation of control strategies and selection of resistant genotypes.

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Validação de escala diagramática para quantificação da severidade da antracnose do colmo do milho

Cited by 15 publications

References 24 publications

Standard Area Diagram Set for Bacterial Spot Quantification in Entire-Margined Leaves of Sour Passion Fruit

Standard Area Diagram Set for Bacterial Spot Quantification in Entire-Margined Leaves of Sour Passion Fruit

Identification and pathogenicity of Fusarium species associated with pokkah boeng of sugarcane in Brazil

Standard area diagram set for olive leaf spot assessment

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