by Paiter Botha | 1 Aug, 2001 | Practical in the vineyard, Winetech Technical
VINEYARDS MORE OR LESS (-) PLANTED THAN UPROOTED (1996- 2000) In 2000 there was a nett decrease of 1 971 hectares of vines compared to the 420 hectares increase in 1999. It is clear from Table 1 that the biggest decrease was in the Malmesbury and Stellenbosch...
by Eben Archer | Viticulture research, Winetech Technical
It is a well-known fact that the quality of any bunch of grapes is directly related to the physiological quality of the shoot on which it hangs. This is the reason why grapes from short shoots (either naturally short or topped too short) as well as from exceptionally...
by Francois Halleen, Paul Fourie & Frikkie Calitz | Viticulture research, Winetech Technical
Eutypa dieback (tandpyn), caused by the fungus Eutypa lata, is a serious disease in South African vineyards. Infection occurs when ascospores (sexual spores) of the fungus enter fresh pruning wounds in mature wood. These ascospores germinate and grow into the healthy...
by Eben Archer | 1 Jul, 2001 | Viticulture research, Winetech Technical
The increasing success of South African wines on the international market at present is the result of quality directed inputs in the entire wine production chain – the production of quality grapes, the application of cutting edge technology in vinificiation and...
by Hannes A Nel, Corine J Moes & Leon M T Dicks | Oenology research, Winetech Technical
Malolactic fermentation (MLF) entails the bacterial conversion of L-malic acid to L(+)-lactic acid and carbon dioxide (Wibowo et al, 1985). This secondary fermentation, which may occur during or after alcoholic fermentation, is usually conducted by Oenococcus oeni...
by Francois Halleen and Gustav Holz | Viticulture research, Winetech Technical
It is accepted that the fungus causing powdery mildew has been occurring on South African vines since approximately 1860. Since then the extent of the disease has increased and today powdery mildew is considered the most important fungal vine disease (Halleen, 1999)....
by David Marais and Dee Blackhurst | 1 Jun, 2001 | Oenology research, Winetech Technical
Wine has been part of man’s lifestyle for thousands of years. Over the past decade there has been renewed interest in the possible beneficial effects of wine on health. While excessive quantities clearly have adverse effects on health in the short and long term, the...
by Francois Halleen, Anette Volkmann & Paul Fourie | Viticulture research, Winetech Technical
The fungus Eutypa lata is the causal agent of eutypiose or Eutypa dieback (tandpyn) of grapevines. Infection occurs when ascospores (sexual spores) of the fungus enter fresh pruning wounds in mature wood. The ascospores germinate and grow into the healthy wood...
by Cobus van Graan | Practical in the vineyard, Winetech Technical
It is a common occurrence for Eutypa infections to reach alarming propotions, especially in vigorously growing, older Sauvignon blanc and Cabernet Sauvignon vineyards. The result is a progressive decrease in the production of eutypa infected vineyards. The main reason...
by Francois Viljoen | Practical in the vineyard, Production, Wineland, Winetech Technical
Indications are that the 2001 wine crop could be the smallest since 1986 (Fig 1), but in terms of quality it looks like this may be one of the best in years. According to a crop survey conducted by SAWIS in mid March, the 2001 wine crop is expected to amount to 964...
by Lourens van Schoor | 1 May, 2001 | Viticulture research, Winetech Technical
Wine production in South Africa has increased over the past decade. This phenomenon is associated with increased pressure on environmental resources such as water, soil and vegetation (Van Schoor, 2000). National legislation and foreign markets stipulate that all...
by Wessel du Toit | Oenology research, Winetech Technical
This is the first of two articles summarising the M. Sc. Research (Oenology) by Wessel du Toit. It was conducted at the Department of Viticulture and Oenology and the Institute for Wine Biotechnology, University of Stellenbosch. Introduction The microbiological...
