WSET Diploma D1 UPDATED Exam
Complete Questions and Guide Answers
100% Verified Graded A+
1. Most important North American grape species
Answer: Vitis labrusca, Vitis riparia, Vitis berlandieri and Vitis rupestris
2. Four main sections of a grape vine
Answer: the main shoots, one-year-old wood, permanent wood and the roots
3. What comprises the canopy of a vine?
Answer: The main shoots and all of their major structures - stem, buds, leaves, lateral shoots, tendrils and
inflorescences/grape bunches
4. What do the main shoots grow from, and when?
Answer: Themainshootsonthevine growin spring from buds retained from the previous year
5. Where are carbohydrates stored in a vine?
Answer: Stems, trunks, roots
6. Define lignify
Answer: Green shoots become woody and rigid, they are then called canes
,7. Where do buds form?
Answer: between the leaf stalk (petiole) and the stem
8. Define the two types of buds
Answer: - 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)
- Prompt buds (form and break open same season, form lateral shoots)
9. What is the main function of lateral shoots? When are they desirable/unde- sirable?
Answer: - 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)
10. What is second crop?
Answer: Lateral shoots often produce inflorescences, which can be known as a '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
11. What is green harvesting?
Answer: Removal of second crop during summer
12. Define one-year-old wood
Answer: the main shoots from the last growing season that were kept at pruning, supports compound buds; cane or
spur
,13. Define permanent wood
Answer: woody parts of the vine that are older than one year, including the trunk
14. where are most roots found?
Answer: top50cm ofsoil
15. what distinguishes PN clone 115?
Answer: low yield, small grapes, good for high quality of red wines
16. what distinguishes PN clone 521?
Answer: high yield, bigger grapes, good for sparkling wine production
17. When is leaf fall and dormancy?
Answer: Nov-March
18. When is budburst?
Answer: March-April
19. When is shoot and leaf growth?
Answer: March-July
20. When is flowering and fruit set?
Answer: May-June
21. When is grape development?
, Answer: June-Oct
22. When is harvest?
Answer: Sept-Oct
23. How does the vine support itself during dormancy?
Answer: starch in the roots, trunk, and branches
24. Below what temp can vines be severly damaged? die?
Answer: -15C, -25C
25. What factors determine the timing of budburst?
Answer: - air temp (>10C)
- soil temp (higher encourages earlier budburst)
- variety
- human factors (e.g. winter pruning late -> later budburst)
26. Why is high continentality good for budburst?
Answer: marked ditterences in temp can result in uniform budburst
27. what determines the vigor of a vine?
Answer: rate of shoot growth
28. when does the fastest rate of shoot growth typically occur?
Complete Questions and Guide Answers
100% Verified Graded A+
1. Most important North American grape species
Answer: Vitis labrusca, Vitis riparia, Vitis berlandieri and Vitis rupestris
2. Four main sections of a grape vine
Answer: the main shoots, one-year-old wood, permanent wood and the roots
3. What comprises the canopy of a vine?
Answer: The main shoots and all of their major structures - stem, buds, leaves, lateral shoots, tendrils and
inflorescences/grape bunches
4. What do the main shoots grow from, and when?
Answer: Themainshootsonthevine growin spring from buds retained from the previous year
5. Where are carbohydrates stored in a vine?
Answer: Stems, trunks, roots
6. Define lignify
Answer: Green shoots become woody and rigid, they are then called canes
,7. Where do buds form?
Answer: between the leaf stalk (petiole) and the stem
8. Define the two types of buds
Answer: - 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)
- Prompt buds (form and break open same season, form lateral shoots)
9. What is the main function of lateral shoots? When are they desirable/unde- sirable?
Answer: - 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)
10. What is second crop?
Answer: Lateral shoots often produce inflorescences, which can be known as a '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
11. What is green harvesting?
Answer: Removal of second crop during summer
12. Define one-year-old wood
Answer: the main shoots from the last growing season that were kept at pruning, supports compound buds; cane or
spur
,13. Define permanent wood
Answer: woody parts of the vine that are older than one year, including the trunk
14. where are most roots found?
Answer: top50cm ofsoil
15. what distinguishes PN clone 115?
Answer: low yield, small grapes, good for high quality of red wines
16. what distinguishes PN clone 521?
Answer: high yield, bigger grapes, good for sparkling wine production
17. When is leaf fall and dormancy?
Answer: Nov-March
18. When is budburst?
Answer: March-April
19. When is shoot and leaf growth?
Answer: March-July
20. When is flowering and fruit set?
Answer: May-June
21. When is grape development?
, Answer: June-Oct
22. When is harvest?
Answer: Sept-Oct
23. How does the vine support itself during dormancy?
Answer: starch in the roots, trunk, and branches
24. Below what temp can vines be severly damaged? die?
Answer: -15C, -25C
25. What factors determine the timing of budburst?
Answer: - air temp (>10C)
- soil temp (higher encourages earlier budburst)
- variety
- human factors (e.g. winter pruning late -> later budburst)
26. Why is high continentality good for budburst?
Answer: marked ditterences in temp can result in uniform budburst
27. what determines the vigor of a vine?
Answer: rate of shoot growth
28. when does the fastest rate of shoot growth typically occur?
