The epidemiology of grapevine yellows disease in South African vineyards

Project Number
WW 06-40

Project title
The epidemiology of grapevine yellows disease in South African vineyards

Project leader
Carstens, R

Team members
Carstens, R
Vermeulen, A
Petersen, Y
Du Toit, E C

Project description
Aster yellows phytoplasma (Candidatus Phytoplasma asteris) was identified recently in vines showing yellows symptoms in the Vredendal and Breede River areas. This is a first report of this disease on grapevine in South Africa. Visual symptom observations were made and spread of the disease (covers approximately 107 ha in the Vredendal area) had been observed but no scientific study had been done to determine the incidence or spread of the disease. Aster yellows is a disease that occurs in several countries and cause serious damage ranging from lower yields to the death of vines. Some of the yellows diseases spread epidemically (Flavescence dorée) and other (BN) has an endemic behaviour with very little spread at all. At the moment we have no idea of the real impact of the disease on South African vineyards because of the lack of knowledge about the tempo of spreading. In order to develop control strategies to combat this disease it is therefore very important to study the epidemiology of the disease.

The aim of this project will be to conduct surveys in selected vineyards (a variety of cultivars) in the Vredendal area to determine the incidence of the disease (distribution patterns) and the increase in incidence (spreading) of the disease over time. This visual field surveys will be confirmed by laboratory assays (PCR).

Poster(s)
Carstens, R, Petersen, Y, Stephan, D and Burger, J T. 2011. Current status of aster yellows disease in South African vineyards. Poster presented at the 2nd Phytopathologist Working Group Meeting. 12-15 September 2011, Neustadt, Germany.

Presentation(s)
Carstens, R. 2008. Aster vergelingsiekte – die nuwe fitoplasma siekte in ons wingerd. Kelderbyeenkoms. 27 May, Paarl, South Africa.

Carstens, R. 2008. Aster vergelingsiekte – die nuwe fitoplasma siekte in ons wingerd. Winetech VinPro Information Day. 29 May. Stellenbosch, South Africa.

Carstens, R. 2008. Aster yellows, the new phytoplasma disease in our vineyards. Presentation at the ARC Infruitec-Nietvoorbij Research Forum, 27 July, ARC Infruitec-Nietvoorbij, Stellenbosch, South Africa

Carstens, R. 2008. Aster vergelingsiekte – die nuwe fitoplasma siekte in ons wingerd. SAWWV Tafel-en droogdruif Inligtingsdag. 5 August
wingerd. SAWWV Tafel-en droogdruif Inligtingsdag. 7 August.
Carstens, R. 2009. Aster yellows, status of the disease in South African vineyards. Nexus Grape and Fruit Training Course. 27 May, Paarl, South Africa

Carstens, R. 2008. Bacterial blight and aster yellows. Presentation to the 3rd Year Plant Pathology Students. 6 October, University of Stellenbosch, Stellenbosch, South Africa,

Carstens, R. 2009. Visual identification of grapevine yellows. Field demonstration to plant inspectors. 3 March.

Carstens, R. 2009. Aster yellows, status of the disease in South African vineyards. Grape and fruit training of Nexus consultants. 27 May, Nexus, Paarl, South Africa

Carstens, R. 2009. Research and services of Plant Protection Division and aster yellows disease. 19 August, ARC Infruitec-Nietvoorbij, Stellenbosch, South Africa.

Carstens, R. 2009. Incidence and spread of aster yellows. Presentation Winetech Virus Group Meeting. 15 September, Stellenbosch, South Africa.

Carstens, R. 2009. Bacterial and phytoplasma disease of vineyards. 3rd Year Plant Pathology Students, University of Stellenbosch, Stellenbosch, South Africa.

Carstens, R. 2009. Aster yellows disease in our vineyards. VinPro Information Day. 27 November, Worcester, South Africa

Carstens, R. 2010. Incidence and distribution of grapevine yellows in South African vineyards. University of Stellenbosch. 18 March, University of Stellenbosch, Stellenbosch, South Africa

Carstens, R. 2010. Aster vergeling siekte – die hele storie tot nou. VinPro Regional Information Days. 4-6 and 11-12 May, Vredendal, Malmesbury, Worcester, Robertson and Stellenbosch, South Africa.

Carstens, R. 2010. Aster vergeling siekte – die hele storie tot nou. Presentation at the Bergriver Table Grape Producers’ Association Post Harvest Meeting. 27 May, Paarl, South Africa

Carstens, R. 2010. Aster yellows disease in South Africa vineyards. Seminar at Centre of Research in Viticulture (CRA). 8 September, Conegliano, Italy

Carstens, R. 2010. Bacterial blight and aster yellows: effect on grapevine and control. 3rd Year Plant Pathology Students. 4 October, University of Stellenbosch, Stellenbosch, South Africa

Carstens, R. 2010. Aster yellow disease in South African vineyards. Presentation tat the APHIS Seminar. 1 December, Stellenbosch, South Africa

Carstens, R. 2011. Aster yellows disease in South African vineyards. Visit of Elsenburg students to ARC Infruitec-Nietvoorbij. 2 March, ARC Infruitec-Nietvoorbij, Stellenbosch, South Africa

Carstens, R. 2011. Aster vergeling: Bespreking van simptome en die situasie in Robertson. VinPro Information Day. 31 March, Robertson, South Africa.

Carstens, R. 2011. Bacterial diseases of grapevine: Bacterial blight and aster yellows. Lecture to the 3rd Year Plant Pathology Students. 4 April, University of Stellenbosch, Stellenbosch, South Africa.

Carstens, R. 2011. Survey in Vredendal vineyards to determine the incidence and spreading of aster yellows disease. Presentation at the 9th Grapevine Virus Workshop, 24 May, ARC Infruitec-Nietvoorbij, Stellenbosch, South Africa

Carstens, R. Aster vergeling simptome. Presentation to the South African Vine Growers Association. 13 August

Carstens, R. 2012. Survey in Vredendal vineyards to determine the incidence and spreading of aster yellows. Presentation to the ARC Infruitec-Nietvoorbij. 30 January, Stellenbosch, South Africa.

Article
Carstens, R. 2008. Aster yellow disease in vineyards in South Africa, WineLand, Mnth Aug (p. 90-91)

Carstens, R, Petersen, Y, Stephan, D, Burger, J T. 2011. Current status of aster yellows disease in infected vineyards in the Vredendal grape producing area of South Africa, Phytopathogenic Mollicutes, v. 1 (2) (p. 83-85)
http://doi.org/10.5958/j.2249-4669.1.2.014

Thesis
Carstens, R. 2014. The incidence and distribution of grapevine yellows disease in South African vineyards. (MSc) University of Stellenbosch, Stellenbosch.
http://hdl.handle.net/10019.1/86683

FinalReport.pdf

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