by Albert Strever & Philip Myburgh | 1 Jan, 2018 | Viticulture research, Winetech Technical
Measurements of carbon isotope discrimination (CID) can be used to study the accumulative effects of strenuous environmental conditions on photosynthesis and gas exchange in the grapevine. Grapevine reaction to these environmental conditions is determined by observing...
by Albert Strever | 1 Dec, 2017 | Viticulture research, Winetech Technical
This article will outline three attempts to link grapevine water status to leaf or canopy-level spectral data in an attempt to find the wavelengths that are most suitable for designing possible instrumentation/sensors for monitoring the plant for irrigation scheduling...
by Johan Fourie | Viticulture research, Winetech Technical
The objective of the study was to determine the effect of different weed management treatments on the stand of wild radish (one of the species that dominated the weed spectrum in the experiment vineyard) over the medium term. Introduction Wild radish (Raphanus...
by Kwaku Achiano | 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 species,...
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 standard...
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 are...
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...
