17 articles in this issue
J.L. Smit,G. Sithole,A.E. Strever
This paper presents a study of precision agriculture in the wine industry. While precision viticulture mostly aimsto maximise yields by delivering the right inputs to appropriate places on a farm in the correct doses and at theright time, the objective of... see more
V. Renouf,M. Favier
Malolactic fermentation (MLF) is a process that is increasingly conducted by Oenococcus oeni industrial strains.Recently, studies of the diversity of O. oeni strains have developed some potential genetic tools to characterise theabilities of the strains. ... see more
D. Belew,T. Astatkie,M.N. Mokashi,Y. Getachew,C.P. Patil
A pilot experiment was conducted to determine the effects of soil salinity and inoculation with arbuscular mycorrhizalfungus (Glomus fasciculatum) on growth (shoot length, leaf number, internode length, and total dry weight), sporecount and root colonisat... see more
L. Butkhup,S. Chowtivannakul,R. Gaensakoo,P. Prathepha,S. Samappito
The seed, skin and whole grape extract of the red grape cultivar Shiraz, which is widely cultivated in NortheasternThailand, were investigated. Total phenolic, total flavonoid and total monomeric anthocyanin contentranged from 48.04 to 116.73 g GAE/100g d... see more
M. Azzolini,E. Tosi,G. Veneri,G. Zapparoli
This study evaluated the efficacy of lysozyme in winemaking to control lactic acid bacteria (LAB). In a wineryvinification, indigenous LAB were partially and completely inhibited when lysozyme was added to red and whitegrape must respectively. This result... see more
F. Etchebarne,H. Ojeda,J.J. Hunter
Seasonal variation in the water, sugar, organic acid and cation contents of developing grape berries (Vitis viniferaL. ‘Grenache noir’) under different levels of water supply (with and without deficit irrigation) and leaf:fruit ratios(18, 10 and five leav... see more
T.T.T. Trinh,W.Y. Woon,B. Yu,P. Curran,S.-Q. Liu
Some amino acids are known to be precursors of aroma-active compounds produced by yeast metabolism. Thisstudy examined the effect of the addition of L-isoleucine and L-phenylalanine on the volatile profiles of longan winefermented by a co-culture of Sacch... see more
F. Halleen,P.H. Fourie,P.J. Lombard
Eutypa dieback, caused by the fungus Eutypa lata, is a serious disease of grapevines that infects mainly through pruningwounds. The aim of this study was to evaluate the in vitro efficacy of fungicides from various chemical groups againstE. lata, as well ... see more
F. Espejo,S. Armada
This work evaluated the effect of two commercial pectolytic enzymes on some oenological parameters before andafter enzymatic treatments with pre-fermentative dynamic maceration at room temperature for three hours. Thestudy was conducted on an industrial s... see more
G. van der Linde,J.L. Fischer,P.P. Coetzee
Wines and their provenance soils from Robertson, Stellenbosch, Swartland and Walker Bay, four major wineproducingregions in the Western Cape Province of South Africa, were analysed by ICP-MS and the elementalcomposition was used in multivariate statistica... see more
M.O. Downey,R.L. Hanlin
Discrepancies in condensed tannin concentrations in grape skin determined by different analytical methodsprompted the closer examination of aspects of the methodologies. One of these was the choice of extraction solvent.Condensed tannins were extracted fr... see more
C.A. de Klerk
Various contact, fumigant and systemic pesticides were evaluated over three years in a field trial for the control ofmale pre-pupae and adult females of Margarodes prieskaensis on grapevines. Cadusafos at 25 mL/m² gave excellentcontrol of male pre-pupae. ... see more
J.C. Fourie,K. Freitag
Five soil management practices (treatments) were applied in a micro-sprinkler irrigated Chardonnay/99 Richtervineyard on a sandy clay loam soil near Robertson, commencing in April 1993 (one year after planting). The effectof the treatments on the soil tem... see more
H.J. Hugo,A.P. Malan Malan
A literature study was carried out to determine what is currently known about the contamination of irrigation water withplant-parasitic nematodes, and what control measures are currently available. Contamination sources of irrigation waterwith plant-paras... see more
K.J . Sommer,F. Hancock,M.O. Downey
The work reported here surveyed the recovery of H4 Sultana from severe drought when grafted to 9 rootstocks (101-14 Millardet, 116-60 Lider, 187-24 Lider, 5BB Kober, 1103 Paulsen, Ramsey, 140 Ruggeri, Schwarzmann and selfgraftedSultana). Vines did not rec... see more
E. Lerm,L. Engelbrecht,M. du Toit
There are two main fermentations associated with the winemaking process. Alcoholic fermentation is conducted bythe yeast culture and malolactic fermentation takes place as a result of the metabolic activity of lactic acid bacteria,specifically from the ge... see more
L. Louw,A.G.J. Tredoux,P. Van Rensburg,M. Kidd,T. Naes,H.H. Nieuwoudt
The volatile composition of 925 single cultivar young Sauvignon blanc, Chardonnay, Pinotage, Merlot, Shirazand Cabernet Sauvignon wines of vintages 2005 to 2007, was determined using gas chromatography – flameionisation detection. Compositional data were ... see more