by Carien Coetzee | 1 Aug, 2017 | Oenology research, Viticulture research, Winetech Technical
Techniques can be used to increase thiols or ensure preservation. Harvesting methods New Zealand winegrowers use mechanical harvesting as a norm. This is probably out of necessity, however, as luck would have it, it is by far the harvesting method delivering the...
by Lucinda Heyns | Viticulture research, Winetech Technical
Introduction Echalas, also known as ‘staked vines’ or ‘stok-by-paaltjie’, is mostly used in the wine producing regions of Côte-Rôtie in France, Priorat in Spain and Mösel in Germany. It is not exactly clear when the first echalas vineyard was planted in South Africa....
by F. Halleen, G. Pietersen, R. Wolhuter, J.T. Burger, E.H. Blancquaert & A.E.C. Jooste | Oenology research, Viticulture research, Winetech Technical
1. Effect of HWT (50°C for 45 minutes) on fungal pathogens in vine nurseries Researcher: F. Halleen The aim of the study will be to determine the effect of Hot Water Treatment (50°C for 45 minutes) on the occurrence of fungal pathogens associated with grapevine...
by Chandré Joubert & Melané Vivier | Viticulture research, Winetech Technical
How often does a producer think of a leaf, or berry, or any of the grapevine organs in terms of their main plant biological functions? Probably not that often; we tend to think of those organs from the perspective of the production of the raw materials (grapes) for...
by E. Moffat, S. Booi, G.O. Sigge & P.J. Welz | 1 Jul, 2017 | Oenology research, Viticulture research, Winetech Technical
1. Improving poor performing grapevines by means of root pruning or mulching Researcher: E. Moffat Spatial variability and grapevine underperformance are common challenges faced by grape growers. Root pruning is currently carried out as a practice based on growers’...
by Johan Fourie & Pieter Raath | Viticulture research, Winetech Technical
This study confirms the importance of responsible nitrogen, phosphorus and potassium fertilisation and underlines the fact that deficiencies of both nitrogen and potassium must be prevented. Experiment background The trial was conducted over four seasons (from...
by Carien Coetzee | Oenology research, Viticulture research, Winetech Technical
Volatile thiols in wine are important compounds contributing to the varietal character of especially Sauvignon blanc wine. Origin of volatile thiols The volatile thiols (4MMP and 3MH) are not present in grapes and are only released/formed from precursors to their...
by Carien Coetzee | 1 Jun, 2017 | Oenology research, Viticulture research, Winetech Technical
Volatile thiols in wine are important compounds contributing to the varietal character of especially Sauvignon blanc wine. Introduction This paper aims to communicate the information and insights obtained from a visit to Marlborough, New Zealand in 2016. Industry...
by Wessel du Toit, Petri de Beer & Albert Strever | Oenology research, Viticulture research, Winetech Technical
The main aim of this study was to investigate the colour and phenolic evolution of Shiraz wines obtained with different training and canopy treatments. Phenolic compounds play an important role in the sensorial composition of red wines, such as Shiraz. However, how...
by Gerhard Pietersen & Rinus Knoetze | Oenology research, Viticulture research, Winetech Technical
1. Investigating the spread of natural vitiviruses Researcher: Gerhard Pietersen During surveys of South African wine grape vineyards, various members of the vitivirus group were detected. The vitiviruses detected were very commonly observed in mixed infections with...
by Johan Fourie & Pieter Raath | Viticulture research, Winetech Technical
This study highlights the importance of responsible nitrogen, phosphorus and potassium fertilisation to obtain optimal grapevine performance. Experiment background The trial was conducted over four seasons (2009/10 to 2012/13) in a full-bearing, seven-year-old drip...
by Pia Addison, Francois Halleen, Wessel du Toit & Hélène Nieuwoudt | 1 May, 2017 | Oenology research, Viticulture research, Winetech Technical
1. Ecology and management of Lobesia vanillana in vineyards Researcher: Pia Addison Lobesia vanillana is a pest species that was recently confirmed to attack wine grapes in the Western Cape. Grapes have not been listed as a host for this pest, therefore its ecology in...
