WINETECH Technical Yearbook 2019

First page Table of contents Next page Last page

INDEX	2
AUTHORS	4
FOREWORD	5
VITICULTURE	6
Lessons to be learned from Israel’s desert agriculture	7
Water footprint of grapes and wine	10
Strategy for the control of mealybug in South African vineyards and wine	12
Detection and classification of grapevine stem pitting-associated virus	14
A new era for wine grape yield estimation	17
Management and re-use of treated winery wastewater (Part 1): New Zealand wineries	20
Management and re-use of treated winery wastewater (Part 2): Dairy and municipal wastewaters in New Zealand	24
Management and re-use of treated winery wastewater (Part 3): Adelaide, Australia	28
TerraClim – online terrain and climate spatial decision support systems	31
Detection and quantification of black foot disease and crown and root rot pathogens in grapevine nurseries	35
Know your seed for cover crop purposes	38
What was the impact of the 2017-18 drought? – a case study using FruitLook data	40
Rugose wood diseases and associated viruses	45
OENOLOGY	49
Organic yeast nutrients and Chardonnay aroma	50
Benchmarking of commercial tannins and mannoproteins	53
Big Data and YAN analysis – new developments in A South African context	55
Chitin, chitinase, chitosan	58
Amino acids in South African grape musts (Part 1): Composition and profiles	61
Amino acids in South African grape musts (Part 2): Cultivar classification	64
Accumulation of volatile phenol glycoconjugates in grapes after bushfires	67
Rapid and cost-effective quantification of YAN concentration and composition – vintage and cultivar effect	69
Thiol-releasing and low VA-forming hybrid wine yeasts	72
Pectinases improve consistency in winemaking	75
Pectin-lyase – the key wine enzyme?	77
Mixed culture fermentations and Shiraz flavour	79
Nitrogen and sulphur foliar fertilization (Part 1): Background and context	82
Nitrogen and sulphur foliar fertilization (Part 2)	86
Nitrogen and sulphur foliar fertilization (Part 3)	90
Melatonin in wine protects your heart	94
Sequential inoculation of Starmerella bacillaris and Saccharomyces cerevisiae – main effects	97
Chenin blanc and Pinotage fermentations with South African Torulaspora delbrueckii yeast isolates	100
Focus on bentonite	103
Alternative theory for multiple sclerosis	106
Stability of young Chenin blanc and Sauvignon blanc wine during storage (Part 1): Chemical evaluation	109
Stability of young Chenin blanc and Sauvignon blanc wine during storage (Part 2): Sensory aspects	113
When microbes get it wrong	116
Random oxidation and the role of bottle dimensions	119
IN THE VINEYARD	121
Gen-Z cover crop demo plots – results and findings from the 2018 season	122
The role of leaf and soil analyses in vineyard management (Part 1)	125
The role of soil and leaf analyses in vineyard management (Part 2)	129
The role of soil and leaf analyses in vineyard management (Part 3)	136
Grapevine lifetime – protection of a valuable asset	139
Looking at favourable vineyard locations in a warmer climate	141
IN THE CELLAR	143
The advantages and disadvantages of oxygen prior to bottling	144
The importance of oxygen control during bottling and the measurement of dissolved oxygen in wine	147
New wine packaging for a changing consumer profile	149
Winemaking with stems	152
Post-harvest practices in wine cellars	154
The use of whisky barrels for wine maturation	156
The role of ellagitannins in the oxidative stability of wine	158
The role of tartaric acid in winemaking	160
The influence of different gasses on flotation	162
Lessons from Provence for the making of rosé wines	163
The environmental awareness of cellars	165
The efficiency of filtration prior to bottling	167
GENERAL	169
The positive contribution to transfer of knowledge	170
Professionalism beckons for the wine industry	172
Vineyard worker skills survey	174
Get up to date with learning and development	177
WINETECH	181

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