Grape-vine Yellows - Aetiology, Epidemiology and Diagnosis
Abstract
Grape-vine Yellows comprise diseases with the same symptoms as Flavescence Doree (FD), a disease severe in Southern France and Italy, and caused by a procaryote. Other members include Bois Noir, Goldgelbe Vergilbung, and Australian Grape-vine Yellows. Yellows diseases have been observed in Europe, Australia, Israel, U.S.A. and Chile. Symptoms include yellow leaves which curl downward, and fall prematurely. Shoots are stunted and remain unlignified, and bunches shrivel and fall at flowering. Baco 22A, Jurancon blanc, Riesling and Chardonnay, are among the most susceptible cultivars. Scaphoideus titanus, the lealbopper vector of FD, is controlled by insecticides and loss from FD is now minimal. The other yellows diseases are of lesser importance and their aetiology is unresolved. Further investigation is needed to clarify the taxonomy of Grape-vine Yellows but the current diagnosis of yellows diseases of grape-vine is dependent on symptoms and at least one of several other features.Downloads
Copyright (c) 2017 South African Society for Enology and Viticulture
This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.
A copyright form will be e-mailed to the corresponding author when the manuscript has been accepted for publication.
In principle, the Author agrees to the following when he/she signes the copyright agreement:
I hereby assign to the SOUTH AFRICAN SOCIETY FOR ENOLOGY AND VITICULTURE (SASEV) the copyright of the text, tables, figures, supplementary material, illustrations and other information (the Material) submitted with the manuscript to be published in SOUTH AFRICAN JOURNAL OF ENOLOGY AND VITICULTURE (SAJEV) (the "Article"). The copyright becomes effective from the date the Article has been accepted for publication in SAJEV.
This is an open access journal, and the authors and journal should be properly acknowledged, when works are cited.
Author's may use the publishers version for teaching purposes, in books, theses, dissertations, conferences and conference papers.
A copy of the authors' publishers version may also be hosted on the following websites:
- Non-commercial personal webpage or blog.
- Institutional webpage.
- Authors Institutional Repository.
The following notice should accompany such a posting on the website: This is an electronic version of an article published in SAJEV, Volume XXX, number XXX, pages XXX - XXX, DOI. Authors should also supply a hyperlink to the original paper or indicate where the original paper (www.journals.ac.za/index.php/sajev/) may be found.
Authors publishers version, affiliated with the Stellenbosch University will be automatically deposited in the University's Institutional Repository SUNScholar.
Articles as a whole, may not be re-published with another journal.
The following license applies:
Attribution CC BY-NC-ND 4.0
