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Faculty of Natural and Agricultural Sciences
School of Biological Sciences
Department of Microbiology and Plant Pathology
Prevention of grapevine leafroll disease spread between successive vineyards at the same site. Winetech 2004-2011
Infection of certified planting material, free of viruses by grapevine leafroll disease is a major problem for the South African Wine Industry. A number of sources and means of spread have been identified in South Africa through spatio-temporal analyses of spread of grapevine leafroll disease in foundation- and mother-blocks. Circumstantial evidence has been obtained that leafroll infection of the newly established block occurred due to the presence of grapevine leafroll disease infection in the preceding vineyard on that site. The aim of this project is 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 to prevent the perpetuation of grapevine leafroll infection from a preceding vineyard.
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