WSET DIPLOMA/WSET DIPLOMA D1 EXAM
QUESTIONA AND CORRECT DETAILED ANSWERS
LATEST UPDATES 2025-2026 (100% CORRECT
VERIFIED ANSWERS) ALREADY GRADED A+
Most important N American grape species
Vitis labrusca, Vitis riparia, Vitis Erlander and Vitis rupestris
what causes coulure?
imbalance in carb levels due to:
- low photosynthesis rates
- vigorous shoot growth diverting carbs (very fertile soils, vigorous rootstocks)
What comprises the canopy of a vine?
The main shoots and all of their major structures - stem, buds, leaves, lateral
shoots, tendrils and inflorescences/grape bunches
What do the main shoots grow from, and when?
,The main shoots on the vine grow in spring from buds retained from the previous
year
Where are carbohydrates stored in a vine?
Stems, trunks, roots
Define lignify
Green shoots become woody and rigid, they are then called canes
Where do buds form?
between the leaf stalk (petiole) and the stem
Define the two types of buds
- Compound buds (form in one growing season and break open the following
growing season, producing main shoots; typically, a primary, secondary, and
maybe tertiary)
- Prompt buds (form and break open same season, form lateral shoots)
What is the main function of lateral shoots? When are they
desirable/undesirable?
- to allow the plant to carry on growing if the tip of the main shoot has been
damaged or eaten
- can provide an additional source of leaves for photosynthesis (useful if the
laterals are near the ends of the main shoots)
,- 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 second crop?
Lateral shoots often produce inflorescences, which can be known as a 'second
crop'
What is green harvesting?
Removal of second crop during summer
Define one-year-old wood
the main shoots from the last growing season that were kept at pruning, supports
compound buds; cane or spur
Define permanent wood
woody parts of the vine that are older than one year, including the trunk
where are most roots found?
top 50cm of soil
, Four main sections of a grape vine
the main shoots, one-year-old wood, permanent wood and the roots
what distinguishes PN clone 115?
low Y, small grapes, good for high Q red wines
what distinguishes PN clone 521?
high Y, bigger grapes, good for sparkling wine production
When is leaf fall and dormancy?
Nov-March
When is budburst?
March-April
When is shoot and leaf growth?
March-July
When is flowering and fruit set?
May-June
QUESTIONA AND CORRECT DETAILED ANSWERS
LATEST UPDATES 2025-2026 (100% CORRECT
VERIFIED ANSWERS) ALREADY GRADED A+
Most important N American grape species
Vitis labrusca, Vitis riparia, Vitis Erlander and Vitis rupestris
what causes coulure?
imbalance in carb levels due to:
- low photosynthesis rates
- vigorous shoot growth diverting carbs (very fertile soils, vigorous rootstocks)
What comprises the canopy of a vine?
The main shoots and all of their major structures - stem, buds, leaves, lateral
shoots, tendrils and inflorescences/grape bunches
What do the main shoots grow from, and when?
,The main shoots on the vine grow in spring from buds retained from the previous
year
Where are carbohydrates stored in a vine?
Stems, trunks, roots
Define lignify
Green shoots become woody and rigid, they are then called canes
Where do buds form?
between the leaf stalk (petiole) and the stem
Define the two types of buds
- Compound buds (form in one growing season and break open the following
growing season, producing main shoots; typically, a primary, secondary, and
maybe tertiary)
- Prompt buds (form and break open same season, form lateral shoots)
What is the main function of lateral shoots? When are they
desirable/undesirable?
- to allow the plant to carry on growing if the tip of the main shoot has been
damaged or eaten
- can provide an additional source of leaves for photosynthesis (useful if the
laterals are near the ends of the main shoots)
,- 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 second crop?
Lateral shoots often produce inflorescences, which can be known as a 'second
crop'
What is green harvesting?
Removal of second crop during summer
Define one-year-old wood
the main shoots from the last growing season that were kept at pruning, supports
compound buds; cane or spur
Define permanent wood
woody parts of the vine that are older than one year, including the trunk
where are most roots found?
top 50cm of soil
, Four main sections of a grape vine
the main shoots, one-year-old wood, permanent wood and the roots
what distinguishes PN clone 115?
low Y, small grapes, good for high Q red wines
what distinguishes PN clone 521?
high Y, bigger grapes, good for sparkling wine production
When is leaf fall and dormancy?
Nov-March
When is budburst?
March-April
When is shoot and leaf growth?
March-July
When is flowering and fruit set?
May-June
