Estudos epidemiológicos e controle químico de Phakopsora euvitis

Naruzawa, Erika Sayuri; Celoto, Mercia Ikarugi Bomfim; Papa, M. F. S.; Tomquelski, Germison Vital; Boliani, Aparecida Conceição

doi:10.1590/s0100-41582006000100007

Cited by 15 publications

(10 citation statements)

References 5 publications

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“…Possibly, it is because the major viticultural areas of the world, which are actually in temperate regions, are free or do not have this disease as a major problem. Previous studies carried out in Brazil showed the effi ciency of triazol and strobilurin on grape rust control in fi eld (NARUZAWA et al, 2006); however, this study carried out in greenhouse approached the protective, curative and eradicative activities of these fungicides.…”

mentioning

confidence: 68%

Protective, curative and eradicative activities of fungicides against grapevine rust

et al. 2014

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The protective, eradicative and curative activities of the fungicides azoxystrobin, tebuconazole, pyraclostrobin+metiram, and ciproconazole against grapevine rust, were determined in greenhouse. To evaluate the protective activity, leaves of potted ´Niagara´ (Vitis labrusca) vines were artificially inoculated with an urediniospore suspension of Phakopsora euvitis four, eight or forteen days after fungicidal spray; and to evaluate the curative and eradicative activities, leaves were sprayed with fungicides two, four or eight days after inoculation. Disease severity was assessed 14 days after each inoculation. All tested fungicides present excellent preventive activity against grapevine rust; however, tebuconazole and ciproconazole provide better curative activity than azoxystrobin and pyraclostrobin+metiram. It was observed also that all tested fungicides significantly reduced the germination of urediniospore produced on sprayed leaves.

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confidence: 68%

Protective, curative and eradicative activities of fungicides against grapevine rust

et al. 2014

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“…Symptoms of Asian grapevine leaf rust appear predominantly on leaves and occasionally on petioles, young shoots, and rachises (Leu, ). Only mature leaves show pustules, as unfolding young leaves are resistant to infection (Naruzawa et al ., ; Angelotti et al ., ). The resistance of young leaves is supposed to be related to stomatal development (Edwards, ); however, the higher susceptibility of older leaves compared to younger ones has also been reported for other Phakopsora species, which do not use stomata for penetration, such as P. pachyrhizi on soybeans (Furtado et al ., ), Phakopsora jatrophicola on Jatropha gossypiifolia (Seier et al ., ) and Phakopsora apoda on kikuyu grass ( Pennisetum clandestinum ; Adendorff & Rijkenberg, ).…”

Section: Disease Symptomsmentioning

confidence: 99%

“…Teliospores germinate in a large range of temperatures (10–30 °C) although the optimum temperatures for teliospore germination and basidiospore formation range from 15 to 25 °C (Edwards, ). Urediniospores germinate by a single germ tube and also at a wide range of temperatures (5–40 °C), although germination rates higher than 20% are observed only between 10 and 25 °C in the dark (Naruzawa et al ., ; Angelotti et al ., ). Whilst germination is favoured by the dark, it is not completely inhibited at low light intensities (Leu & Wu, ; Naruzawa et al ., ; Angelotti et al ., ).…”

Section: Plant Infectionmentioning

confidence: 99%

Asian grapevine leaf rust caused by Phakopsora euvitis: an important disease in Brazil

Primiano¹,

Loehrer

Amorim³

et al. 2017

Plant Pathology

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Anthropogenic influences such as tourism and climate change affect ecosystems. One consequence is that invasive species can spread to and colonize novel areas. A recent example of this scenario is the appearance, in the early 2000s in Brazil and Australia, of the plant pathogenic fungus Phakopsora euvitis, which causes Asian grapevine leaf rust. It is speculated that the disease was introduced either by long distance transport of spores in the atmosphere or the import of contaminated plant material. While the disease could be eradicated from the Australian continent it is still present in Brazil. The pathogen has spread successfully throughout most Brazilian grapevine-growing regions, most probably because of the lack of resistant plant cultivars. Today, the disease is endemic in Brazil. This review was written to highlight the increasing impact of the disease in Brazil and summarizes the current knowledge on the disease monocycle under different environmental conditions and the consequences for grapevine management. Gaps in the present state of knowledge are highlighted with the purpose of stimulating further research aimed at identifying efficient strategies to combat the disease.

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“…continuous darkness and the lowest germination under continuous light. Naruzawa et al (11) evaluated the effect of light (light and dark) and temperature (5, 10. 15, 20 25, 30 35 and 40°C) on the germination of P. euvitis Ono and observed that absence of light provided the greatest germination to the temperature of 25°C, while the light or dark regime was indifferent to higher temperatures.…”

Section: Substratementioning

confidence: 99%

In vitro effect of substrate, temperature and photoperiod on Phakopsora pachyrhizi urediniospore germination and germ tube growth

Blum

Reis

et al. 2015

Summa phytopathol.

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In vitro experiments were conducted to assess the effects of substrate, temperature and time of exposure to temperature and photoperiod on P. pachyrhizi uredospore germination and germ tube growth. The following substrates were tested: water-agar and soybean leaf extract-agar at different leaf concentrations (0.5, 1.0, 2.0 and 4.0 g of leaves and 15g agar/L water), temperatures (10, 15, 20, 25, 30, and 35oC) and times of exposure (1, 2, 3, 4, 5, 6, 7, and 8 hours) to temperature and 12 different photoperiods. The highest germination and germ tube length was found for the soybean leaf extract agar. Maximum P. pachyrhizi uredospore germination was obtained at 21.8 and 22.3°C, and maximum germ tube growth at 21.4 and 22.1°C. The maximum uredospore germination was found at 6.4 hours exposure, while the maximum germ tube length was obtained at 7.7 h exposure. Regarding photoperiod, the maximum spore germination and the maximum uredospore germ tube length were found in the dark. Neither spore germination nor uredospore germ tube growth was completely inhibited by the exposure to continuous light.

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Estudos epidemiológicos e controle químico de Phakopsora euvitis

Cited by 15 publications

References 5 publications

Protective, curative and eradicative activities of fungicides against grapevine rust

Protective, curative and eradicative activities of fungicides against grapevine rust

Asian grapevine leaf rust caused by Phakopsora euvitis: an important disease in Brazil

In vitro effect of substrate, temperature and photoperiod on Phakopsora pachyrhizi urediniospore germination and germ tube growth

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