by Hans Hugo & Rinus Knoetze | 1 Mar, 2018 | Viticulture research, Winetech Technical
Root-knot nematodes (Meloidogyne spp.) are common in South African vineyards and nursery soils, with M. javanica being the most common species. Soil fumigation and chemical control do not necessarily completely eradicate root-knot nematodes from the soil. Nurserymen...
by Hans Hugo & Rinus Knoetze | 1 Feb, 2018 | Viticulture research, Winetech Technical
The ring nematode, Criconemoides xenoplax, is one of the most common and abundant nematode species in vineyards throughout the Western Cape. Feeding by ring nematodes result in the destruction of grapevine root tissue and a stunted root system with relatively few live...
by Danie van Schalkwyk & André Schmidt | 1 Jan, 2018 | Viticulture research, Winetech Technical
This article is a follow-up on the articles regarding lesser-known red wine grape cultivars that were published (Van Schalkwyk & Schmidt, 2016a & 2016b). According to Sawis (2015) statistics, 101 different wine grape cultivars are planted in South Africa....
by Johan Fourie | Viticulture research, Winetech Technical
The objective of this study was to determine the effect of different weed management treatments on the stand of musk herons bill, one of the species that dominated the weed spectrum in the experiment vineyard, over the medium term. Introduction Musk herons bill...
by Albert Strever & Philip Myburgh | 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...
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...
