Elaboração e validação de escala diagramática para avaliação da pústula bacteriana em soja

Acco, Laura Feuser; Gomes, Diego Genuário; Matos, Janaina N.; Ribeiro, Neucimara Rodrigues; Balbi-Peña, María Isabel

doi:10.1590/0100-5405/211476

Cited by 3 publications

(2 citation statements)

References 6 publications

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“…According to Mafia, Ferreira, Binoti and Leite (2011), R 2 values of up to 0.70 are considered low, thus, all inexperienced evaluators who did not use the proposed diagrammatic scale and experienced evaluator 6 who presented low precision, were corrected with the use of the proposed diagrammatic scale. These results corroborate those of other validation studies of diagrammatic scales where there was an increase in the accuracy of visual evaluations of disease severity when using the proposed diagrammatic scales (Acco, Gomes, Matos, Ribeiro & Balbi-Peña, 2020;Alves et al, 2015;Nunes & Alves, 2012;Trojan & Pria, 2018).…”

Section: Resultssupporting

confidence: 89%

Validation of a diagrammatic scale for quantification of bacterial leaf blight (causal agent Pseudomonas avenae) in maize

Lorenzetti

Tartaro

Stangarlin

et al. 2020

Semina: Ciênc. Agrár.

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The area cultivated with wheat has been increasing in the savannahs of the state of Minas Gerais, Brazil. Aphids are usually one of the main pests of wheat in many regions of the world; however, little is known about the aphid population in this new environment. The southern region of Brazil, the main wheat production area, has had several problems as a result of aphids, but aphid populations and the resulting impact on wheat production have not been investigated in these new crop production areas. Understanding control strategies to manage this insect could be essential for the “Cerrado” wheat that is grown in this area. The application of silicon (Si) has the potential to reduce the population growth of wheat aphids; however no field studies have been reported. Hence, we evaluated the effect of Si fertilization via soil application on the aphid populations and species composition and on yield components of wheat in three locations in Minas Gerais; the experiment was repeated simultaneously in Uberlândia, at the experimental areas of UFU and IFTM, and in Montes Claros, at the experimental area of UFMG, using the cultivars BRS 264 and BRS 394. The aphids first appeared just before wheat earing; they were then sampled six times over the course of the study, seven days apart, starting from 45 days after sowing. The aphid species Sitobion avenae (Fabricius), Schizaphis graminum (Rondani), and Rhopalosiphum padi (Linnaeus) were observed in all three locations; S. avenae was the dominant species in all locations. The experimental area of UFU had the highest number of S. avenae aphids per tiller for both cultivars, while UFMG had the lowest populations. Aphid populations and wheat yield components were not affected by soil Si fertilization. There was no difference in yield as a result of location or cultivar, but the location UFU and the cultivar BRS 394 had the greatest average hectoliter weight.

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Section: Resultssupporting

confidence: 89%

Validation of a diagrammatic scale for quantification of bacterial leaf blight (causal agent Pseudomonas avenae) in maize

Lorenzetti

Tartaro

Stangarlin

et al. 2020

Semina: Ciênc. Agrár.

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“…In contrast, approximately 91% of the evaluators had an angular coefficient substantially different from 1 (p = 0.05), with an average of 0.84 (Table 2). Values similar to these have been obtained in other diagrammatic scale assessment studies (Nascimento, Michereff, Mariano, & Gomes, 2005;Vivas et al, 2010;Damasceno et al, 2014).…”

Section: Evaluatorsupporting

confidence: 87%

Diagrammatic scale for the quantification of black spot severity in papaya leaves

Francelino,

Vivas,

Moraes

et al. 2023

Acta Sci. Agron.

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Black spot (Asperisporium caricae) is one of the main foliar fungal diseases of papaya crops. This disease acts directly on leaves and fruits causing leaf area reduction and fruit deterioration. The quantification of diseases is a fundamental part of the disease management and control process; therefore, a scale is required to help quantify black spot disease. The objective of this work was to propose a standardized methodology to quantify black spot severity in papaya leaves. A scale was developed considering the maximum and minimum values of the disease in the field that included eight levels of severity: 0.1, 0.3, 0.6, 1.0, 2.3, 5.0, 10.0, and 20.0%. Without the aid of a scale the disease is often overestimated, with absolute errors of approximately 75%. When the scale was used, 100% of the evaluators showed improved accuracy and precision, and absolute error was reduced to the 10% range. The scale also provided good repeatability and high reproducibility. The use of the scale provided an improvement in the R2 values, with mean values of 93 and 92 in the second and third evaluations, respectively, demonstrating that the scale is useful for different aspects of the pathosystem of A. caricae, such as for determining the efficiency of fungicides, characterization of varietal resistance, construction of the disease progression curve, and estimation of damage.

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Validation of a diagrammatic scale for quantification of bacterial leaf blight (causal agent Pseudomonas avenae) in maize

Lorenzetti

Tartaro

Stangarlin

et al. 2020

Semina: Ciênc. Agrár.

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Bacterial leaf blight occurs in almost the entire Brazilian territory and can cause significant economic damage. However, its effects can be curtailed with the following tools that aid in quantification for carrying out the best severity assessment that can be applied to the studies used in its control. The objective of this study was to develop and validate a diagrammatic scale to quantify the severity of bacterial leaf blight in maize caused by Pseudomonas avenae. Corn leaves were collected with different levels of disease severity, and the total leaf area as well as the injured area of the middle third of each leaf was measured. From this, the minimum and maximum limits of the disease and, subsequently, four intermediate levels were determined whilst taking into account the law of visual stimulus of Weber-Fechner. Levels 1.5%, 2.5%, 9%, 18%, 46%, and 70% were selected with validation performed by eight evaluators, four inexperienced and four experienced. These evaluators estimated the severity values, initially without the use of the proposed diagrammatic scale and in a second attempt with the use of the scale. We concluded that it was possible to improve the accuracy and precision of the evaluators when they used the scale as a tool to assess the severity of bacterial leaf blight on corn leaves.

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Elaboração e validação de escala diagramática para avaliação da pústula bacteriana em soja

Cited by 3 publications

References 6 publications

Validation of a diagrammatic scale for quantification of bacterial leaf blight (causal agent Pseudomonas avenae) in maize

Validation of a diagrammatic scale for quantification of bacterial leaf blight (causal agent Pseudomonas avenae) in maize

Diagrammatic scale for the quantification of black spot severity in papaya leaves

Validation of a diagrammatic scale for quantification of bacterial leaf blight (causal agent Pseudomonas avenae) in maize

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