Estudos sôbre a mancha aureolada do cafeeiro

Costa, Á. S.; Silva, Darcy Martins da

doi:10.1590/s0006-87051960000100081

Cited by 3 publications

(5 citation statements)

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“…Some descriptive scales have been used to assess the severity of bacterial blight, such as the ones by Costa and Silva (), Sera et al. (), Ito et al.…”

Section: Introductionmentioning

confidence: 99%

“…Some descriptive scales have been used to assess the severity of bacterial blight, such as the ones by Costa and Silva (1960), Sera et al (2004), Ito et al (2008) and Zoccoli et al (2011). These scales were used to evaluate the intensity of disease in seedlings in both nursery and field; however, the amount of injuries and percentage of diseased leaves were considered instead of the amount of diseased leaf area (DLA).…”

Section: Introductionmentioning

confidence: 99%

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Diagrammatic Scale for Assessment of Bacterial Blight in Coffee Leaves

Belan

Pozza

Freitas

et al. 2014

Journal of Phytopathology

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Due to the lack of a standardized visual method for assessing bacterial blight (Pseudomonas syringae pv. garcae) in coffee leaves, a diagrammatic scale was developed and validated to quantify the disease. Leaves were collected in crops and nursery with different intensity of symptoms, and the true severity was determined electronically. Based on the frequency distribution of severity values and according to the Weber-Fechner's law of visual stimulus, the minimum and maximum limits and the intermediate levels in the scale were determined. Validation was performed by ten evaluators who estimated the severity of 50 leaves with different intensity of symptoms. One evaluation was performed without diagrammatic scale and two evaluations with the scale at 7-day intervals. The accuracy, precision, repeatability and reproducibility of the estimates were evaluated. The scale had nine levels: 0 (0%), 1 (0.1-0.99%), 2 (1-2%), 3 (2.01-4%), 4 (4.01-8%), 5 (8.01-16%), 6 (16.01-25%), 7 (25.01-45%) and 8 (≥45.1%). Using the scale, the evaluators were able to improve accuracy, precision, reproducibility and repeatability of estimates, compared to evaluators without scale. The scale was appropriate to visual estimation of severity of bacterial blight in coffee leaves.

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“…Some descriptive scales have been used to assess the severity of bacterial blight, such as the ones by Costa and Silva (), Sera et al. (), Ito et al.…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Diagrammatic Scale for Assessment of Bacterial Blight in Coffee Leaves

Belan

Pozza

Freitas

et al. 2014

Journal of Phytopathology

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“…Tobacco target spot is a disease first identified by Costa in Brazil in 1948 [10]. It has been increasingly detected in various regions since the 1980s [11].…”

Section: Introductionmentioning

confidence: 99%

Unveiling the Potential of Bacillus safensis Y246 for Enhanced Suppression of Rhizoctonia solani

Zhu,

Xu,

Wang

et al. 2023

JoF

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Rhizoctonia solani is a significant pathogen affecting various crops, including tobacco. In this study, a bacterial strain, namely Y246, was isolated from the soil of healthy plants and exhibited high antifungal activity. Based on morphological identification and DNA sequencing, this bacterial strain was identified as Bacillus safensis. The aim of this investigation was to explore the antifungal potential of strain Y246, to test the antifungal stability of Y246 by adjusting different cultivation conditions, and to utilize gas chromatography–mass spectrometry (GC-MS) to predict the volatile compounds related to antifungal activity in Y246. In vitro assays demonstrated that strain Y246 exhibited a high fungal inhibition rate of 76.3%. The fermentation broth and suspension of strain Y246 inhibited the mycelial growth of R. solani by 66.59% and 63.75%, respectively. Interestingly, treatment with volatile compounds derived from the fermentation broth of strain Y246 resulted in abnormal mycelial growth of R. solani. Scanning electron microscopy analysis revealed bent and deformed mycelium structures with a rough surface. Furthermore, the stability of antifungal activity of the fermentation broth of strain Y246 was assessed. Changes in temperature, pH value, and UV irradiation time had minimal impact on the antifungal activity, indicating the stability of the antifungal activity of strain Y246. A GC-MS analysis of the volatile organic compounds (VOCs) produced by strain Y246 identified a total of 34 compounds with inhibitory effects against different fungi. Notably, the strain demonstrated broad-spectrum activity, exhibiting varying degrees of inhibition against seven pathogens (Alternaria alternata, Phomopsis. sp., Gloeosporium musarum, Dwiroopa punicae, Colletotrichum karstii, Botryosphaeria auasmontanum, and Botrytis cinerea). In our extensive experiments, strain Y246 not only exhibited strong inhibition against R. solani but also demonstrated remarkable inhibitory effects on A. alternata-induced tobacco brown spot and kiwifruit black spot, with impressive inhibition rates of 62.96% and 46.23%, respectively. Overall, these findings highlight the significant antifungal activity of B. safensis Y246 against R. solani. In addition, Y246 has an excellent antifungal stability, with an inhibition rate > 30% under different treatments (temperature, pH, UV). The results showed that the VOCs of strain Y246 had a strong inhibitory effect on the colony growth of R. solani, and the volatile substances produced by strain Y246 had an inhibitory effect on R. solani at rate of 70.19%. Based on these results, we can conclude that Y246 inhibits the normal growth of R. solani. These findings can provide valuable insights for developing sustainable agricultural strategies.

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“…Symptoms of bacterial halo blight are found on leaves, flowers, fruit and young branches (Costa and Silva 1960). Lesions on the leaves are irregular, dark-brown colored, with a yellow halo around.…”

Section: Introductionmentioning

confidence: 99%

“…In more severe attacks, branches and fruits necrosis may occur. Young crops are more sensitive, and may suffer general defoliation, die-back, overbudding, and delaying the initial vegetation growth (Amaral et al 1956, Costa et al 1957, Costa and Silva 1960. In nurseries, the symptoms are very similar, but the spread is facilitated by the density of the plants, which provides ideal environment for the development of the disease, causing necrosis of new leaves and die-back, and in many cases, leading to the death of plants (Rodrigues et al 2013).…”

Section: Introductionmentioning

confidence: 99%

Resistance to bacterial halo blight in Arabica coffee lines derivative from the genotype C1195-5-6-2 under natural infection conditions

Andreazi

Sera

et al. 2018

Crop Breed. Appl. Biotechnol.

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The aim of this study was to identify resistance to bacterial halo blight in Arabica coffee lines carrying Coffea racemosa genes. Eighteen Arabica coffee lines derivative from the genotype C1195-5-6-2, and the cultivars IAPAR 59 and IPR 99 were evaluated for resistance to bacterial halo blight in two trials carried out in field conditions, in Londrina, PR, Brazil. The cultivars Mundo Novo IAC 376-4 and Catuaí Vermelho IAC 81 were included as susceptible controls. Ten lines and the cultivar IAPAR 59 showed resistance to bacterial halo blight. The cultivar IPR 99 presented intermediate reaction, and the controls were very susceptible. This is the first study to show that lines derivative from the genotype C1195-5-6-2, which has C. racemosa genes, could be a source of resistance to bacterial halo blight in coffee breeding programs.

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Estudos sôbre a mancha aureolada do cafeeiro

Cited by 3 publications

References 0 publications

Diagrammatic Scale for Assessment of Bacterial Blight in Coffee Leaves

Diagrammatic Scale for Assessment of Bacterial Blight in Coffee Leaves

Unveiling the Potential of Bacillus safensis Y246 for Enhanced Suppression of Rhizoctonia solani

Resistance to bacterial halo blight in Arabica coffee lines derivative from the genotype C1195-5-6-2 under natural infection conditions

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