Metodologia para avaliação do índice de severidade de doença em amostras de tubérculos de batata

Granja, Newton do Prado; Hirano, Élcio Shiyoiti; Silva, Giovani Olegário da

doi:10.1590/s0102-05362013000400002

Cited by 3 publications

(2 citation statements)

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“…Vol.65: e22210059, 2022 www.scielo.br/babt At the end of 86 days after planting (DAP), the shoot was removed from the plants for tuber maturation. And after 10 days, the following parameters were collected and evaluated: number of lesioned tubers; lesion area, using the James scale for lesion [21]; severity index, calculated by the method of Granja and coauthors [22] modified, using the James scale [21] to evaluate and apply the grades; percentage of losses, obtained by the weight of lesioned tubers in relation to the total weight of plant tubers; and frequency of tuber by lesion type.…”

Section: Methodsmentioning

confidence: 99%

Antagonist Species to Streptomyces sp. that Causes Common Potato Scab

Porto

Rebouças

José

et al. 2022

Braz. arch. biol. technol.

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Potato scab is one of the main diseases affecting potato tubers during their development, causing great commercial damage to farmers. The use of some antagonistic microorganisms has been shown as a viable alternative to phytosanitary control of several crops. However, this work aimed to verify in vitro effects of microorganisms antagonistic against phytopathogenic Streptomyces sp. and in vivo treatment of scab in potato tubers. Trichoderma longibrachiatum; Trichoderma harzianum; Pochonia clamydosporia; Bacillus subtilis (except for in vivo test); Bacillus subtilis + Trichoderma longibrachiatum, and Bacillus subtilis + Enterococcus faecium were tested for in vitro growth inhibition of Streptomyces via microorganism radial pairing test, with both volatile and non-volatile metabolites. In parallel, the antagonistic microorganisms were tested in vivo in protected environments by cultivating potato plants in pots with soil contaminated with Streptomyces sp., then evaluating the number of injured tubers, injured area, severity index, production losses and the frequency of tubers by lesion type. The results indicate major in vitro inhibition of Streptomyces sp. by Trichoderma longibrachiatum, Trichoderma harzianum, and Bacillus subtilis + Enterococcus faecium under the antagonism (48 -80%) and antibiosis tests, as well as a major reduction of tuber lesions size (34 -60%), severity index, and production losses in the in vivo test.

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Section: Methodsmentioning

confidence: 99%

Antagonist Species to Streptomyces sp. that Causes Common Potato Scab

Porto

Rebouças

José

et al. 2022

Braz. arch. biol. technol.

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show abstract

“…Consequently, managing these diseases becomes an intricate task, underscoring the vital importance of early-stage detection and severity assessment. The evaluation of disease severity assumes particular significance as it paves the way for the adoption of targeted treatments and the implementation of adaptable pesticide dosing strategies, thus effectively curtailing control expenditures [6].…”

Section: Introductionmentioning

confidence: 99%

A Two-Stage Approach to the Study of Potato Disease Severity Classification

Xu,

Gao,

Wang

et al. 2024

Agriculture

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Early blight and late blight are two of the most prevalent and severe diseases affecting potato crops. Efficient and accurate grading of their severity is crucial for effective disease management. However, existing grading methods are limited to assessing the severity of each disease independently, often resulting in low recognition accuracy and slow grading processes. To address these challenges, this study proposes a novel two-stage approach for the rapid severity grading of both early blight and late blight in potato plants. In this research, two lightweight models were developed: Coformer and SegCoformer. In the initial stage, Coformer efficiently categorizes potato leaves into three classes: those afflicted by early blight, those afflicted by late blight, and healthy leaves. In the subsequent stage, SegCoformer accurately segments leaves, lesions, and backgrounds within the images obtained from the first stage. Furthermore, it assigns severity labels to the identified leaf lesions. To validate the accuracy and processing speed of the proposed methods, we conduct experimental comparisons. The experimental results indicate that Coformer achieves a classification accuracy as high as 97.86%, while SegCoformer achieves an mIoU of 88.50% for semantic segmentation. The combined accuracy of this method reaches 84%, outperforming the Sit + Unet_V accuracy by 1%. Notably, this approach achieves heightened accuracy while maintaining a faster processing speed, completing image processing in just 258.26 ms. This research methodology effectively enhances agricultural production efficiency.

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Biocontrol of Potato Common Scab Cultivated on Different Soil Mulch

et al. 2022

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Potato common scab causes significant economic losses worldwide, and current control methods remain ineffective. However, biological control methods have been effective in controlling phytopathogens in several other crops. Trichoderma spp. and Bacillus subtilis are the most studied microorganisms in agriculture for controlling plant diseases. However, interactions between these biological control agents and the organic matter present at the cultivation site have not been extensively studied. Therefore, the objective of this study was to evaluate the action of biological agents in controlling potato common scab using different soil mulch compositions. Two field experiments were performed simultaneously: one tested T. longibrachiatum (TL) and T. asperellum (TA) treatments in the control of potato scab, and the other tested two types of soil mulch (vetch and palisade grass) and four microorganism treatments (TL, TA, B. subtilis + Enterococcus faecium + Lactobacillus plantarum (BSEFLP), and B. subtilis + B. licheniformis + T. longibrachiatum (BSBLTL)). In the first experiment, TL and TA decreased the disease severity from 80% in the control to 34%, and 56% in the control to 5%, respectively, based on yield losses caused by the potato scab. In the second experiment, TA and BSEFLP reduced the disease severity to 61% and 62%, respectively, compared with that in the control (98%), and losses caused by the common scab to 38% and 40%, respectively, when combined with vetch mulch (control: 98%), demonstrating that microbial response can be influenced by the cover crop. Therefore, this work provides evidence that biological control of potato common scab is a viable alternative for disease control.

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Metodologia para avaliação do índice de severidade de doença em amostras de tubérculos de batata

Cited by 3 publications

References 0 publications

Antagonist Species to Streptomyces sp. that Causes Common Potato Scab

Antagonist Species to Streptomyces sp. that Causes Common Potato Scab

A Two-Stage Approach to the Study of Potato Disease Severity Classification

Biocontrol of Potato Common Scab Cultivated on Different Soil Mulch

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