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|a 10.1094/PDIS-91-4-0470A
|2 doi
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|a eng
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| 100 |
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|a Auger, J
|e verfasserin
|4 aut
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|a First Report of Black Foot Disease of Grapevine Caused by Cylindrocarpon macrodidymum in Chile
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|c 2007
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| 336 |
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|a Text
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|a ƒaComputermedien
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|a ƒa Online-Ressource
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|a Date Revised 20.11.2019
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|a published: Print
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|a Citation Status PubMed-not-MEDLINE
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|a Black foot disease, caused by Cylindrocarpon macrodidymum Halleen, Schroers & Crous, is reported damaging table and wine grapes (Vitis vinifera L.) for the first time in Chile. During the summer of 2006, 2- to 5-year-old grapevines showed reduced vigor, shortened internodes, and drying and dying shoots along with abnormal development of roots with growth parallel to the soil surface, necrotic root crowns, and development of secondary roots. Internal necrosis extended from the bark to the pith in diseased parts of the plants. Other symptoms included black discoloration of the wood, gum inclusions in xylem vessels, black streaks in the vascular tissue, and reduction in root biomass, with sunken, necrotic root lesions. Eighteen Cylindrocarpon isolates were collected from roots, vascular elements, and pith tissue of grapevines cultivars (Flame Seedless, Red Globe, Thompson Seedless, Merlot, Carmenere, and Cabernet Sauvignon) from 12 locations in Chile. The isolates were identified on the basis of morphological features. All isolates produced micro- and macroconidia (one to three septa) and chlamydospores in short and intercalary chains (1,4), and by internal transcribed spacer (ITS1-5,8S-ITS4) rDNA and β -tubulin (BT1, and BT2) partial sequences, identical to those of C. macrodidymum (isolate USS074, GenBank Accession No. AY 997558 and isolate USSO150, GenBank Accession No. AY 997598) (2). Phylogenetic analyses placed these isolates in a clade closely related, but clearly distinct from other clades, to C. destructans and C. liriodendri (2,3). Pathogenicity tests were completed by drench inoculation onto 50 6-month-old rooted cuttings of 'Red Globe' with 25 ml of conidia suspension (106 conidia ml-1) obtained from four isolates. Ten control cuttings of 'Red Globe' were inoculated with an equal volume of sterile distilled water. The plants were incubated for 4 months in a controlled environment facility at 24°C. All isolates tested were pathogenic. In addition, they caused significant root rot (t-test of disease incidence, P = 0.0048) and no significant level of variation was detected between different isolates. C. macrodidymum was reisolated from the region of brown streaking in all the inoculated cuttings and was not isolated from the water-treated controls. To our knowledge, this is the first report of C. macrodidymum causing black foot disease on grapevine in Chile. References: (1) C. D. Booth. Mycol. Pap. (CMI) 104:1, 1966. (2) F. Halleen et al. Stud. Mycol. 50:431, 2004. (3) F. R. Mantiri et al. Can. J. Bot. 79:334, 2001. (4) E. Petit and W. D. Gubler. Plant Dis. 89:1051, 2005
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| 650 |
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|a Journal Article
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|a Esterio, M
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|a Pérez, I
|e verfasserin
|4 aut
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|g 91(2007), 4 vom: 01. Apr., Seite 470
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