WSET DIPLOMA D1 ACTUAL TEST
COMPREHENSIVE REVIEW PRACTICE
SOLUTION 2026 GUARANTEED TO PASS.
⫸ Millerandage - high proportion of seedless grapes, which ripen but
are smaller than grapes with seeds
reduces the volume of wine that can be produced
caused by cold windy weather at pollination and fruit set
⫸ Ripening - sugar is produced in leaves at max rates of
photosynthesis at 18-33C
too hot conditions can cause extreme water stress and shut the vine
down
tartaric acid gets diluted, malic acid used for respiration
methoxypyrazines levels fall
tannins ripen and polymerize
anthocyanins increase (15-25C)
⫸ What does the length of the ripening stage depend on? - Grape
variety
climatic conditions
management of the vine and vineyard
time of harvest
,⫸ Factors affecting grape growing - Temperature
sunlight
latitude
altitude
slopes and aspect
proximity to water
winds
soils
mist, fog, clouds
diurnal range
⫸ Define El Niño - a climatic cycle in the Pacific Ocean
ENSO El Nino Southern Oscillation
effect on water patterns
warm water moves towards the Carribean
warmer than average temps in S. America, Pacific Northwest
drought in western Australia
occurs once every 3-7 years
La Niña - warm in Cali, wet and cool in Australia
⫸ define diurnal range - temperature difference between day and
night
⫸ Natural factors that affect water availability - rainfall
, topography
evapotranspiration rate (temp, humidity, wind)
⫸ List most important vine nutrients - nitrogen
potassium
phosphorus
calcium
magnesium
(sulfur, manganese, boron, copper, iron, zinc)
⫸ How is climate defined? - the annual pattern of temperature,
sunlight, rainfall, humidity and wind, averaged out over several years
⫸ Growing Degree Days - A form of the degree-day used as a guide
for crop planting and for estimating crop maturity dates.
Invented for California by Amerine and Winkler in 1944
• subtract 10C from the average mean temp of a month in the growing
season
• multiply by number of days in that month
• repeat for each month in the growing season
• add together the totals
⫸ Other Indexes - Huglin Index (1978)
Mean temp of the warmest month (MJT) 1980
COMPREHENSIVE REVIEW PRACTICE
SOLUTION 2026 GUARANTEED TO PASS.
⫸ Millerandage - high proportion of seedless grapes, which ripen but
are smaller than grapes with seeds
reduces the volume of wine that can be produced
caused by cold windy weather at pollination and fruit set
⫸ Ripening - sugar is produced in leaves at max rates of
photosynthesis at 18-33C
too hot conditions can cause extreme water stress and shut the vine
down
tartaric acid gets diluted, malic acid used for respiration
methoxypyrazines levels fall
tannins ripen and polymerize
anthocyanins increase (15-25C)
⫸ What does the length of the ripening stage depend on? - Grape
variety
climatic conditions
management of the vine and vineyard
time of harvest
,⫸ Factors affecting grape growing - Temperature
sunlight
latitude
altitude
slopes and aspect
proximity to water
winds
soils
mist, fog, clouds
diurnal range
⫸ Define El Niño - a climatic cycle in the Pacific Ocean
ENSO El Nino Southern Oscillation
effect on water patterns
warm water moves towards the Carribean
warmer than average temps in S. America, Pacific Northwest
drought in western Australia
occurs once every 3-7 years
La Niña - warm in Cali, wet and cool in Australia
⫸ define diurnal range - temperature difference between day and
night
⫸ Natural factors that affect water availability - rainfall
, topography
evapotranspiration rate (temp, humidity, wind)
⫸ List most important vine nutrients - nitrogen
potassium
phosphorus
calcium
magnesium
(sulfur, manganese, boron, copper, iron, zinc)
⫸ How is climate defined? - the annual pattern of temperature,
sunlight, rainfall, humidity and wind, averaged out over several years
⫸ Growing Degree Days - A form of the degree-day used as a guide
for crop planting and for estimating crop maturity dates.
Invented for California by Amerine and Winkler in 1944
• subtract 10C from the average mean temp of a month in the growing
season
• multiply by number of days in that month
• repeat for each month in the growing season
• add together the totals
⫸ Other Indexes - Huglin Index (1978)
Mean temp of the warmest month (MJT) 1980
