by Kwaku Achiano | 1 Dec, 2017 | Viticulture research, Winetech Technical
In this study, the seasonal occurrence of the harlequin beetle (Harmonia axyridis) was monitored in four vineyards and the adjacent windbreaks over three growing seasons in the Western Cape Province. Harlequin beetle, Harmonia axyridis (Pallas) (Coleoptera:...
by Johan Fourie | 1 Nov, 2017 | Viticulture research, Winetech Technical
The objective of the study was to determine the effect of different weed management treatments on the stand of the ryegrasses (one of the species that dominated the spectrum in the experiment vineyard) over the medium term. Introduction A group of Lolium...
by Philip Young & Melané Vivier | 1 Oct, 2017 | Viticulture research, Winetech Technical
Grapevine cultivars are remarkably adaptable to their environments and responsive to production manipulations. This adaptability is (scientifically) described as phenotypic- or metabolic plasticity. You might not have heard these terms before, but they underpin the...
by Lucinda Heyns & Elleunorah Allsopp | Practical in the vineyard, Viticulture research, Winetech Technical
HOW? Mealybug transmits leafroll virus. Leafroll reduces yield, grape and wine quality, and it shortens the lifespan of vines. We can never win the battle against leafroll disease if we do not deal with mealybug. We have the means and know-how at our disposal....
by Melané Vivier | Viticulture research, Winetech Technical
If you hear terms like “defensive structures”, the “arms race”, “decoys”, “triggers”, “signals” and “reinforcements”, you might think that a military battle strategy is under discussion. These battle-related terms are, however, also characteristic of a largely unseen...
by OIV | 1 Sep, 2017 | Oenology research, Viticulture research, Winetech Technical
The 15th General Assembly of the International Organisation of Vine and Wine (OIV), which met on 2 June 2017 in Sofia (Bulgaria), adopted a total of 22 resolutions. Decisions on viticulture and the environment In the field of viticulture, the OIV adopted a...
by Carien Coetzee | Oenology research, Viticulture research, Winetech Technical
Thiols in SA’s top performing wines and the effect of sensory interactions. Interaction with other wine components The Top 10 Sauvignon Blanc competition, presented by the Sauvignon Blanc Interest Group of South Africa and sponsored by First National Bank, is...
by Cheusi Mutawila, Francois Halleen & Lizel Mostert | Viticulture research, Winetech Technical
Experiments were conducted to determine the effect of early and late pruning on Trichoderma spp. wound colonisation. Impact of grapevine trunk diseases Grapevine trunk diseases, namely Eutypa dieback, Petri disease and esca, Botryosphaeria and Phomopsis dieback...
by Johan Fourie | Viticulture research, Winetech Technical
This study emphasise the importance of controlling weeds chemically during grapevine bud break. Experimental background Two weed management practices were applied, as described in Table 1. The trial was conducted over four seasons (2009/10 to 2012/13) in a...
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...
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...
