11/24/25, 11:00 AM WSET Diploma D1 Exam (2025) Exam Questions & Answers | Latest Already Graded A+ UPDATE 2025|2026!! STUDY GUIDE E…
WSET Diploma D1 Exam (2025) Exam Questions &
Answers | Latest Already Graded A+ UPDATE
2025|2026!! STUDY GUIDE EXAM
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Terms in this set (248)
Most important North Vitis labrusca, Vitis riparia, Vitis berlandieri and Vitis
American grape species rupestris
Four main sections of a the main shoots, one-year-old wood, permanent
grape vine wood and the roots
The main shoots and all of their major structures -
What comprises the
stem, buds, leaves, lateral shoots, tendrils and
canopy of a vine?
inflorescences/grape bunches
What do the main shoots The main shoots on the vine grow in spring from buds
grow from, and when? retained from the previous year
Where are carbohydrates Stems, trunks, roots
stored in a vine?
Green shoots become woody and rigid, they are then
Define lignify
called canes
Where do buds form? between the leaf stalk (petiole) and the stem
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,11/24/25, 11:00 AM WSET Diploma D1 Exam (2025) Exam Questions & Answers | Latest Already Graded A+ UPDATE 2025|2026!! STUDY GUIDE E…
- Compound buds (form in one growing season and
break open the following growing season, producing
main shoots; typically a primary, secondary, and
Define the two types of
maybe tertiary)- Prompt buds (form and break open
buds
same season, form lateral shoots)
- Prompt buds (form and break open same season,
form lateral shoots)
- to allow the plant to carry on growing if the tip of
What is the main function
the main shoot has been damaged or eaten
of lateral shoots? When
- can provide an additional source of leaves for
are they
photosynthesis (useful if the laterals are near the ends
desirable/undesirable?
of the main shoots)
Lateral shoots often produce inflorescences, which
can be known as a 'second crop'
What is second crop? - Growth of laterals nearer the base of the main shoot
can be undesirable as they impede air flow and can
shade the fruit too much
What is green harvesting? Removal of second crop during summer
the main shoots from the last growing season that
Define one-year-old
were kept at pruning, supports compound buds; cane
wood
or spur
woody parts of the vine that are older than one year,
Define permanent wood
including the trunk
where are most roots top 50cm of soil
found?
what distinguishes PN low yield, small grapes, good for high quality of red
clone 115? wines
what distinguishes PN high yield, bigger grapes, good for sparkling wine
clone 521? production
When is leaf fall and Nov-March
dormancy?
When is budburst? March-April
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,11/24/25, 11:00 AM WSET Diploma D1 Exam (2025) Exam Questions & Answers | Latest Already Graded A+ UPDATE 2025|2026!! STUDY GUIDE E…
When is shoot and leaf March-July
growth?
When is flowering and May-June
fruit set?
When is grape June-Oct
development?
When is harvest? Sept-Oct
How does the vine starch in the roots, trunk, and branches
support itself during
dormancy?
Below what temp can -15C, -25C
vines be severly
damaged? die?
- air temp (>10C)
- soil temp (higher encourages earlier budburst)
What factors determine
- variety
the timing of budburst?
- human factors (e.g. winter pruning late -> later
budburst)
Why is high continentality marked differences in temp can result in uniform
good for budburst? budburst
what determines the vigor rate of shoot growth
of a vine?
when does the fastest rate between budburst and flowering
of shoot growth typically
occur?
what could cause low - excessive leaf removal
carb levels in roots, trunk, - water stress
and branches? - high crop loads in prev season
what can slow initial shoot low carb levels
growth rates?
https://quizlet.com/1112594208/wset-diploma-d1-exam-2025-exam-questions-answers-latest-already-graded-a-update-20252026-study-guide-exam-f… 3/32
, 11/24/25, 11:00 AM WSET Diploma D1 Exam (2025) Exam Questions & Answers | Latest Already Graded A+ UPDATE 2025|2026!! STUDY GUIDE E…
what supports shoot photosynthesis
growth in later stages?
at what point of the vine late stages of shoot growth (can affect
growing cycle is water photosynthesis)
stress not desired?
- weak shoots
what can stunted shoot
- reduction in leaf number/smaller leaves
growth lead to?
- inflorescences that do not flower properly
- low temp (<25C)
what can limit bud - water stress
fruitfulness? - shading
- nutrient deficiency
how long after budburst 8 weeks (temp dependent)
does flowering typically
take place?
why are warm conditions speeds up flowering (occurs within a few days)
(>17C) desired during
flowering?
what % of flowers become 30%
grapes typically?
what temp does pollen 26-32C
germination require?
what negatively affects wind, rain, cold temps; wind, water stress, hot temps
pollen tube growth?
A condition of the grape bunch in which fruit set has
failed for a high proportion of flowers. This occurs
define coulure
when ovule fertilisation is unsuccessful, and therefore
no grape develops.
imbalance in carb levels due to:
- low photosynthesis rates
what causes coulure?
- vigorous shoot growth diverting carbs (very fertile
soils, vigorous rootstocks)
https://quizlet.com/1112594208/wset-diploma-d1-exam-2025-exam-questions-answers-latest-already-graded-a-update-20252026-study-guide-exam-f… 4/32
WSET Diploma D1 Exam (2025) Exam Questions &
Answers | Latest Already Graded A+ UPDATE
2025|2026!! STUDY GUIDE EXAM
Save
Terms in this set (248)
Most important North Vitis labrusca, Vitis riparia, Vitis berlandieri and Vitis
American grape species rupestris
Four main sections of a the main shoots, one-year-old wood, permanent
grape vine wood and the roots
The main shoots and all of their major structures -
What comprises the
stem, buds, leaves, lateral shoots, tendrils and
canopy of a vine?
inflorescences/grape bunches
What do the main shoots The main shoots on the vine grow in spring from buds
grow from, and when? retained from the previous year
Where are carbohydrates Stems, trunks, roots
stored in a vine?
Green shoots become woody and rigid, they are then
Define lignify
called canes
Where do buds form? between the leaf stalk (petiole) and the stem
https://quizlet.com/1112594208/wset-diploma-d1-exam-2025-exam-questions-answers-latest-already-graded-a-update-20252026-study-guide-exam-f… 1/32
,11/24/25, 11:00 AM WSET Diploma D1 Exam (2025) Exam Questions & Answers | Latest Already Graded A+ UPDATE 2025|2026!! STUDY GUIDE E…
- Compound buds (form in one growing season and
break open the following growing season, producing
main shoots; typically a primary, secondary, and
Define the two types of
maybe tertiary)- Prompt buds (form and break open
buds
same season, form lateral shoots)
- Prompt buds (form and break open same season,
form lateral shoots)
- to allow the plant to carry on growing if the tip of
What is the main function
the main shoot has been damaged or eaten
of lateral shoots? When
- can provide an additional source of leaves for
are they
photosynthesis (useful if the laterals are near the ends
desirable/undesirable?
of the main shoots)
Lateral shoots often produce inflorescences, which
can be known as a 'second crop'
What is second crop? - Growth of laterals nearer the base of the main shoot
can be undesirable as they impede air flow and can
shade the fruit too much
What is green harvesting? Removal of second crop during summer
the main shoots from the last growing season that
Define one-year-old
were kept at pruning, supports compound buds; cane
wood
or spur
woody parts of the vine that are older than one year,
Define permanent wood
including the trunk
where are most roots top 50cm of soil
found?
what distinguishes PN low yield, small grapes, good for high quality of red
clone 115? wines
what distinguishes PN high yield, bigger grapes, good for sparkling wine
clone 521? production
When is leaf fall and Nov-March
dormancy?
When is budburst? March-April
https://quizlet.com/1112594208/wset-diploma-d1-exam-2025-exam-questions-answers-latest-already-graded-a-update-20252026-study-guide-exam-f… 2/32
,11/24/25, 11:00 AM WSET Diploma D1 Exam (2025) Exam Questions & Answers | Latest Already Graded A+ UPDATE 2025|2026!! STUDY GUIDE E…
When is shoot and leaf March-July
growth?
When is flowering and May-June
fruit set?
When is grape June-Oct
development?
When is harvest? Sept-Oct
How does the vine starch in the roots, trunk, and branches
support itself during
dormancy?
Below what temp can -15C, -25C
vines be severly
damaged? die?
- air temp (>10C)
- soil temp (higher encourages earlier budburst)
What factors determine
- variety
the timing of budburst?
- human factors (e.g. winter pruning late -> later
budburst)
Why is high continentality marked differences in temp can result in uniform
good for budburst? budburst
what determines the vigor rate of shoot growth
of a vine?
when does the fastest rate between budburst and flowering
of shoot growth typically
occur?
what could cause low - excessive leaf removal
carb levels in roots, trunk, - water stress
and branches? - high crop loads in prev season
what can slow initial shoot low carb levels
growth rates?
https://quizlet.com/1112594208/wset-diploma-d1-exam-2025-exam-questions-answers-latest-already-graded-a-update-20252026-study-guide-exam-f… 3/32
, 11/24/25, 11:00 AM WSET Diploma D1 Exam (2025) Exam Questions & Answers | Latest Already Graded A+ UPDATE 2025|2026!! STUDY GUIDE E…
what supports shoot photosynthesis
growth in later stages?
at what point of the vine late stages of shoot growth (can affect
growing cycle is water photosynthesis)
stress not desired?
- weak shoots
what can stunted shoot
- reduction in leaf number/smaller leaves
growth lead to?
- inflorescences that do not flower properly
- low temp (<25C)
what can limit bud - water stress
fruitfulness? - shading
- nutrient deficiency
how long after budburst 8 weeks (temp dependent)
does flowering typically
take place?
why are warm conditions speeds up flowering (occurs within a few days)
(>17C) desired during
flowering?
what % of flowers become 30%
grapes typically?
what temp does pollen 26-32C
germination require?
what negatively affects wind, rain, cold temps; wind, water stress, hot temps
pollen tube growth?
A condition of the grape bunch in which fruit set has
failed for a high proportion of flowers. This occurs
define coulure
when ovule fertilisation is unsuccessful, and therefore
no grape develops.
imbalance in carb levels due to:
- low photosynthesis rates
what causes coulure?
- vigorous shoot growth diverting carbs (very fertile
soils, vigorous rootstocks)
https://quizlet.com/1112594208/wset-diploma-d1-exam-2025-exam-questions-answers-latest-already-graded-a-update-20252026-study-guide-exam-f… 4/32
