Análise do desenvolvimento de Cercospora beticola frente ao fungicida tebuconazol

Pittner, Elaine; Piva, Rafael; Santos, Jony Cley dos; Santos, Leandro Alvarenga; Faria, Cacilda Márcia Duarte Rios

doi:10.5935/paet.v9.n03.06

Cited by 2 publications

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References 2 publications

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“…Although the present study is preliminary and prospective, demonstration of occurrence of the leaf spot pathogen of NZ spinach in 'seeds' deserves further investigation in Brazil and elsewhere. Pittner et al (2016), showed that C. beticola impaired beetroot seed quality, leading to loss of viability of 'seeds', and poor germination and emergence after sowing, and contributed to disseminating the pathogen over long distances. It is likely that the same applies to this fungus on NZ spinach.…”

Section: Taxonomymentioning

confidence: 99%

Cercospora beticola causes leaf and stem spots of New Zealand spinach (Tetragonia tetragonoides) in Brazil

PEREIRA,

BARRETO,

ALVES

2023

Phytopathol. Mediterr.

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New Zealand (NZ) spinach (Tetragonia tetragonoides) is an important leafy vegetable crop in Brazil and other countries. This plant is used as a substitute for common spinach because it is rustic and tolerant to tropical and subtropical environmental conditions. It is often affected by a leaf and stem spot disease, which increases in severity during the warm climatic periods. Cercospora tetragoniae has been reported as the cause of this disease, but this is based on an early description of a Cercospora-like species on this host in Argentina, first named Cercosporina tetragoniae but later recombined into Cercospora. In the present study, isolates of Cercospora-like fungi were obtained from NZ spinach and beetroot plants in Brazil, and a multigene molecular study including the act, cal, gapdh, his3, ITS, and tef1-α regions was carried out to identify the causative pathogen. Additionally, morphological and cross inoculation studies were conducted with isolates obtained from diseased plants. The pathogen was confirmed as Cercospora beticola, a common and harmful pathogen of beetroot (Beta vulgaris). Cross-inoculations of isolates obtained from NZ spinach and beetroot showed that the isolates are infective to both hosts. This increases knowledge of epidemiology and management of this important disease. Several attempts to re-collect samples from the type locality in Argentina failed. NZ spinach is no longer grown at La Plata (Argentina), the type locality of C. tetragoniae. Therefore, the task of re-collecting the pathogen is still pending, for epitype designation and for a full clarification of the taxonomic status of C. tetragoniae. The possibility of the pathogen being seed-transmitted has been assessed, and evidence obtained justifies further assessment of this aspect.

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Section: Taxonomymentioning

confidence: 99%

Cercospora beticola causes leaf and stem spots of New Zealand spinach (Tetragonia tetragonoides) in Brazil

PEREIRA,

BARRETO,

ALVES

2023

Phytopathol. Mediterr.

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“…citrulina with slow growth, however, the mycelium coloration was white to gray. Although, it is a characteristic of the genus Cercospora, Pittner et al (2016), studying the development of Cercospora beticola reported a more accelerated mycelial growth of the colony, as in seven days the final colony diameter ranged from 30.75 to 46.50 mm. The differences in morphological and physiological characters found in the present study may be related to the conditions of the culture medium, as well as related to the natural variability of populations of the genus Cercospora.…”

Section: /9mentioning

confidence: 99%

Morphophysiological and molecular characterization of Cercospora spp. in Fragaria × ananassa Duch.

Krahn,

Muniz,

Savian

et al. 2022

Agraria

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The strawberry crop (Fragaria × ananassa Duch.) originated in Europe and has a wide geographical distribution. In Brazil, cultivation is predominant in the southern regions of the country. Foliar diseases are one of the main problems of the crop and are caused by fungal species of different genera. Recently, Cercospora spp. has been reported as a causal agent of cercosporiosis on strawberry leaves. Thus, the objective of this study was to evaluate the pathogenicity and to morphophysiologically and molecularly characterize isolates of Cercospora spp. obtained from strawberry leaves. Pathogenicity was evaluated on detached leaves, morphophysiological characterization on different culture media, and molecular identification by the actin and elongation factor1-alpha regions. The morphological characteristics were similar to those found in species of the genus Cercospora. Cercosporiosis in strawberry is caused by a complex of species of the genus Cercospora, among them C. kikuchii.

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Análise do desenvolvimento de Cercospora beticola frente ao fungicida tebuconazol

Cited by 2 publications

References 2 publications

Cercospora beticola causes leaf and stem spots of New Zealand spinach (Tetragonia tetragonoides) in Brazil

Cercospora beticola causes leaf and stem spots of New Zealand spinach (Tetragonia tetragonoides) in Brazil

Morphophysiological and molecular characterization of Cercospora spp. in Fragaria × ananassa Duch.

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