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Your search keyword '"Phomopsis vaccinii"' showing total 6 results
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6 results on '"Phomopsis vaccinii"'

1. Morphological Diversity of Phomopsis vaccinii Isolates from Cranberry ( Vaccinium macrocarpon Ait.) in Latvia.

Author

Vilka, Liga and Volkova, Julija

Subjects
*CRANBERRIES, *PHOMOPSIS, *PLANT morphology, *CONIDIA, *PLANT diseases
Abstract

Phomopsis vaccinii cause a serious disease of blueberry, cranberry and other Vaccinium crops in the North America and Europe as well. Over 1000 species names are described by Phomopsis spp., but their biology and life style are mostly unknown. Identification of P. vaccinii by methods of classical phytopathology is difficult and complicate, because many species are morphologically similar to P. vaccinii, and P. vaccinii itself has diverse patterns of colony morphology. For this investigation P. vaccinii isolates were obtained from five cranberry plantations in different locations of Latvia (Babite, Alsunga, Rucava, Ape and Pargauja municipality) from berries affected by viscid rot at harvest and storage in 2010. Altogether 44 P. vaccinii isolates were cultivated on potato dextrose agar for description of colony morphology. In order to find some relationships between samples, the isolates were arranged in different groups on the basis of mycelium color and structure (zoning), reverse pigmentation, pycnidium formation time, size, location, number and size of conidia. During this study the colonies of P. vaccinii from cranberry in Latvia showed different morphological features in culture and no relationships between growing regions and groups of isolates were found. P. vaccinii is easy to confuse with other Phomopsis species if only classical phytopathological methods are used. [ABSTRACT FROM AUTHOR]

Published
2015
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2. Resistance of Blueberry Cultivars to Botryosphaeria Stem Blight and Phomopsis Twig Blight.

Author

Polashock, James J. and Kramer, Matthew

Subjects
*PLANT stem diseases & pests, *BLUEBERRIES, *FUNGICIDES, *PHYTOPATHOGENIC fungi, *BOTRYOSPHAERIA, *PHOMOPSIS
Abstract

Stem diseases of blueberry (Vaccinium spp.) can cause significant crop loss as well as loss of entire bushes. Stem diseases are also more difficult to control with fungicides than foliar or fruit diseases. A screening program was initiated to test blueberry cultivars for resistance to two pathogenic fungi: botryosphaeria stem blight and phomopsis twig blight. An attached stem assay was developed to compare the host response with both fungi. The relative resistance of 50 blueberry cultivars was assessed using stem lesion lengths, analyzed on a log scale, taken at 4 weeks postinoculation. For Botryosphaeria stem blight, mean lesion length ranged from about 10 mm in resistant cultivars to about 140 mm in susceptible cultivars. The half-high cultivars Northsky, Northblue, and Chippewa, and the Iowbush cultivar Putte were among the most resistant. Phomopsis twig blight lesions ranged in mean length from about 18 to 98 mm. Similar to results for Botryosphaeria stem blight, resistance was limited to half-high ('Northsky' and 'Chippewa') and lowbush ('Blomidon', 'Chignecto', and 'Cumberland') cultivars. Individual cultivars resistant to one pathogen were not necessarily resistant to the other; although, overall, the resistances were correlated. Approximate 95% confidence intervals were established for all cultivars to predict mean performance across years. The cultivars tested varied in resistance, but the largest single factor affecting lesion length was the fungal isolate used for inoculations. These data enable us to identify cultivars resistant to both diseases that can be used for planting in problem areas, as well as selection of parental material for breeding cultivars with improved resistance. [ABSTRACT FROM AUTHOR]

Published
2006
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3. PHOMOPSIS VACCINII ON VACCINIUM CORYMBOSUM IN LITHUANIA.

Author

Kačergius, Audrius, Jovaišiené, Zita, and Valiuškaité, Alam

Subjects
*PHOMOPSIS, *SPHAEROPSIDACEAE, *PLANT protection, *BLUEBERRIES, *VACCINIUM, *EPIDEMICS
Abstract

The present note is the first report about detection of Phomopsis canker on highbush blueberries in Lithuania. Phomopsis vaccinii was isolated from diseased plants into pure culture, and morphologic characteristics of cultures on different media were described. This fungus was included into the A1 list of Quarantine Pests of European and Mediterranean Plant Protection Organization (EPPO) and to the list of Quarantine Pests of Lithuania. [ABSTRACT FROM AUTHOR]

Published
2004

5. Scientific Opinion on the pest categorisation of Diaporthe vaccinii Shear

Author

Baker, Richard, Bragard, Claude, Candresse, Thierry, Gilioli, Gianni, Grégoire, Jean Claude, Holb, Imre, Jeger, Michael John, Karadjova, Olia Evtimova, Magnusson, Christer, Makowski, David, Manceau, Charles, Navajas, Maria, Rafoss, Trond, Rossi, Vittorio, Schans, Jan, Schrader, Gritta, Urek, Gregor, Vloutoglou, Irene, Werf, Wopke van der, and Winter, Stephan

Subjects
Vaccinium spp, Veterinary (miscellaneous), consequences, TP1-1185, Plant Science, Microbiology, law.invention, law, Quarantine, medicine, distribution, Blight, TX341-641, Phytosanitary certification, Canker, biology, Nutrition. Foods and food supply, Agroforestry, Ecology, Host (biology), Chemical technology, Phomopsis twig blight, fungi, food and beverages, biology.organism_classification, medicine.disease, canker and dieback, Phomopsis vaccinii, biology, distribution, consequences, Phomopsis vaccinii, Vaccinium spp., canker and dieback, Phomopsis twig blight, Phomopsis, Animal Science and Zoology, Parasitology, PEST analysis, Settore AGR/12 - PATOLOGIA VEGETALE, Food Science, Vaccinium
Abstract

The European Commission requested the EFSA Panel on Plant Health to perform a pest categorisation of Diaporthe vaccinii Shear, the fungal agent responsible for twig blight, canker, viscid rot, fruit rot and storage rot of several Vaccinium species. The pest is listed in Annex IIAI of Directive 2000/29EC. D. vaccinii is a single taxonomic entity and methods exist for its discriminative detection. The host is restricted to Vaccinium species, the main cultivated hosts being blueberries and cranberries. Hosts are cultivated throughout Europe, and wild Vaccinium species are common components of forests. Conditions are conducive to disease development in most areas of Europe, but not in all Member States (MSs). The disease is currently present in Latvia with restricted distribution and the pest is under surveillance in The Netherlands. In the one Latvian report, storage losses were observed on cranberry, but these losses were caused by a complex of pathogens, including D. vaccinii, which was isolated with a low incidence. Detection methods are available but cultural and morphological identifications should be confirmed with molecular tools owing to the presence of other Phomopsis species on Vaccinium in Europe. The pathogen can spread via the movement of (asymptomatic) infected or contaminated host plants for planting. No information exists on any methods applied for the control of D. vaccinii in the EU. D. vaccinii does not have the potential to be a quarantine pest as it does not fulfil one of the pest categorisation criteria defined in International Standard for Phytosanitary Measures No 11, that of having a severe impact. Data are not sufficient to conclude on pest categorisation of D. vaccinii based on the criteria of the International Standard for Phytosanitary Measures No 21 because there is no information about the level of potential consequences as a result of the use of infected host plants for planting. © European Food Safety Authority, 2014

Published
2014

6. Detection of Phomopsis vaccinii on Blueberry and Cranberry in Europe by Direct Tissue Blot Immunoassay and Plate-Trapped Antigen ELISA

Author

A. Kacergius, J. Gabler, and Z. Jovaisiene

Subjects
Phomopsis vaccinii, biology, medicine.diagnostic_test, Physiology, Plant Science, Fungi imperfecti, biology.organism_classification, Microbiology, Blot, Antigen, Phomopsis, Ericaceae, Immunoassay, Genetics, medicine, Agronomy and Crop Science, Vaccinium
Abstract

Upright dieback, caused by Phomopsis vaccinii Shear (teleomorph Diaporthe vaccinii Shear), is an economically important disease that could threaten blueberry and cranberry production. Diagnosis of the disease by traditional phytopathological methods is difficult. We report the successful detection of P. vaccinii by direct tissue blot immunoassay (DTBIA) and plate-trapped antigen enzyme-linked immunosorbent assay (PTA-ELISA). The infected samples obtained from Lithuania are the findings reported on the fungus in Europe.

Published
2004
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