Project title
Prevention of grapevine leafroll disease spread between successive vineyards on the same site

Project leader
Pietersen, G

Institution
ARC Plant Protection Research Institute

Project description
A number of sources and means of spread of grapevine leafroll disease have been identified in South Africa through spatio-temporal analyses of spread of grapevine leafroll disease in foundation- and mother-blocks. At one of these sites circumstantial evidence was obtained that leafroll infection of a newly established blocks occurred due to the presence of grapevine leafroll disease infection with attendant viruliferous mealybugs in the preceding vineyard on that site. It is extremely difficult to separate this mode of spread from other primary spread modes at most sites, and the frequency of occurrence of this means of spread is unknown, but may be significant. Unfortunately, as sites suitable for optimal viticulture is limited in South Africa, producers are forced to establish new vineyards at sites where Vitis was planted previously, thereby probably perpetuating the leafroll problem at these sites. In this project we wish to confirm the spread of leafroll between two successive vineyard blocks and perform a field experiment designed to assess control methods such as the use of fallow periods, systemic insecticide use with or without herbicide, and possibly also soil fumigation (depending on availability of a suitable compound and a large enough vineyard block) to prevent the perpetuation of grapevine leafroll infection from a preceding vineyard

Presentation(s)
1. Pietersen, G. 2006. Tackling the grapevine leafroll disease problem in South Africa. 44th Congress of the South African Society for Plant Pathology, 22-25 January, South Africa.
2. Pietersen, G, Spreeth, N, Oosthuizen, T W, Van Rensburg, A, Tooth, D, Rossouw, N. 2006. An integrated control strategy to prevent the spread of grapevine leafroll disease on Vergelegen wine estate - a model for the South African wine industry. 29th National Congress for the South African Society of Enology and Viticulture Conference, 14-17 November, Somerset West, South Africa.
3. Pietersen, G. 2006. Use of remote sensing to monitor the spread of grapevine disease in South Africa. 15th Meeting of the International Council for the Study of Virus and Virus-like Diseases of the Grapevine, 3-7 April, Stellenbosch, South Africa.
4. Saccaggi, D L, Krüger, K and Pietersen, G. 2006. Rapid identification of three mealybug species by multiplex PCR. 15th Meeting of the International Council for the Study of Virus and Virus-like Diseases of the Grapevine, 3-7 April, Stellenbosch, South Africa.
5. Pietersen, G. 2007. Progress report. Winetech Information Day. 2 May, Stellenbosch, South Africa.
6. Pietersen, G. 2007. Virus epidemiology. Winetech Virus Information Day. 4 May, Stellenbosch. South Africa.
7. Pietersen, G. 2008. Grapevine leafroll disease in South Africa. Talk presented to producers invited by New Zealand Wine, 6 March, Martinborough, New Zealand.
8. Pietersen, G. 2008. Current studies on leafroll controll in South Africa. Talk presented to producers invited by New Zealand Wine, 6 March, Martinborough, New Zealand.
9. Pietersen, G. 2008. Grapevine leafroll disease in South Africa. Talk presented to producers invited by New Zealand Wine, 7 March, Napier, New Zealand.
10. Pietersen, G. 2008. Current studies on leafroll controll in South Africa. Talk presented to producers invited by New Zealand Wine, 7 March, Napier, New Zealand.
11. Pietersen, G. 2008. Grapevine leafroll disease in South Africa. Talk presented to producers invited by New Zealand Wine, 10 March, Gisborne, New Zealand.
12. Pietersen, G. 2008. Current studies on leafroll controll in South Africa. Talk presented to producers invited by New Zealand Wine, 10 March, Gisborne, New Zealand.
13. Pietersen, G. 2008. Grapevine leafroll disease in South Africa. Talk presented to producers invited by New Zealand Wine, 12 March, Marlborough, New Zealand.
14. Pietersen, G. 2008. Current studies on leafroll controll in South Africa. Talk presented to producers invited by New Zealand Wine, 12 March, Marlborough, New Zealand.
15. Pietersen, G. 2008. Grapevine leafroll disease in South Africa. Talk presented to producers invited by New Zealand Wine, 13 March, Nelson, New Zealand.
16. Pietersen, G. 2008. Current studies on leafroll controll in South Africa. Talk presented to producers invited by New Zealand Wine, 13 March, Nelson, New Zealand.

Pietersen, G. 2006. Use of remote sensing to monitor the spread of grapevine leafroll disease in South Africa. IN: Extended abstracts of the 15th meeting of the international council for the study of virus and virus-like diseases of the grapevine, 3-7 April, Stellenbosch, South Africa. p. 122-123

Chapter

Pietersen, G. 2006. Spatio-temporal distribution dynamics of grapevine leafroll disease in Western Cape vineyards. IN: Extended abstracts of the 15th meeting of the international council for the study of virus and virus-like diseases of the grapevine, 3-7 April, Stellenbosch, South Africa. p. 126-127

Saccagi, D L, Krüger, K, Pietersen, G. 2006. Rapid identification of three mealybug species by multiplex PCR. IN: Extended abstracts of the 15th meeting of the international council for the study of virus and virus-like diseases of the grapevine, 3-7 April, Stellenbosch, South Africa. p. 124-125

Spreeth, N, Oosthuizen, W T, Van Rensburg, A, Tooth, D, Rossouw, N, Pietersen, G. 2006. Vergelegen, South Africa: A case study of an integrated control strategy to prevent the spread of grapevine leafroll disease. IN: Extended abstracts of the 15th meeting of the international council for the study of virus and virus-like diseases of the grapevine, 3-7 April, Stellenbosch, South Africa. p. 142-143

Spreeth, N A, Oosthuizen, W T, Van Rensburg, A, Tooth, D, Rossouw, N, Pietersen, G. 2006. Vergelegen, South Africa: A case study of an integrated control strategy to prevent the spread of grapevine leafroll disease. IN: Extended abstracts of the 15th meeting of the international council for the study of virus and virus-like diseases of the grapevine, 3-7 April, Stellenbosch, South Africa. p. 142-143

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