Exam (elaborations)
WSET Diploma D1 Updated Exam 2024/2025 with complete solution
- Course
- Institution
WSET Diploma D1 Updated Exam 2024/2025 with complete solution
[Show more]
Content preview
WSET Diploma D1 Updated Exam 2023with complete solution
Most important N American grape species Ans- Vitis labrusca, Vitis riparia, Vitis
berlandieri and Vitis rupestris
Four main sections of a grape vine Ans- the main shoots, one-year-old wood,
permanent wood and the roots
What comprises the canopy of a vine? Ans- 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? Ans- The main shoots on the vine
grow in spring from buds retained from the previous year
Where are carbohydrates stored in a vine? Ans- Stems, trunks, roots
Define lignify Ans- Green shoots become woody and rigid, they are then called canes
Where do buds form? Ans- between the leaf stalk (petiole) and the stem
Define the two types of buds Ans- - 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?
Ans- - 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? Ans- Lateral shoots often produce inflorescences, which can
be known as a 'second crop'
What is green harvesting? Ans- Removal of second crop during summer
Define one-year-old wood Ans- the main shoots from the last growing season that
were kept at pruning, supports compound buds; cane or spur
,Define permanent wood Ans- woody parts of the vine that are older than one year,
including the trunk
where are most roots found? Ans- top 50cm of soil
what distinguishes PN clone 115? Ans- low Y, small grapes, good for high Q red
wines
what distinguishes PN clone 521? Ans- high Y, bigger grapes, good for sparkling
wine production
When is leaf fall and dormancy? Ans- Nov-March
When is budburst? Ans- March-April
When is shoot and leaf growth? Ans- March-July
When is flowering and fruit set? Ans- May-June
When is grape development? Ans- June-Oct
When is harvest? Ans- Sept-Oct
How does the vine support itself during dormancy? Ans- starch in the roots, trunk,
and branches
Below what temp can vines be severly damaged? die? Ans- -15C, -25C
What factors determine the timing of budburst? Ans- - air temp (>10C)
- soil temp (higher encourages earlier budburst)
- variety
- human factors (e.g. winter pruning late -> later budburst)
Why is high continentality good for budburst? Ans- marked differences in temp can
result in uniform budburst
Chard, PN, Merlot, Grenache are ______ budding Ans- early
SB, Cab, Syrah are ________ budding Ans- late (need higher temps)
what determines the vigor of a vine? Ans- rate of shoot growth
when does the fastest rate of shoot growth typically occur? Ans- between budburst
and flowering
, what could cause low carb levels in roots, trunk, and branches? Ans- - excessive leaf
removal
- water stress
- mildew
- high crop loads in prev season
what can slow initial shoot growth rates? Ans- low carb levels
what supports shoot growth in later stages? Ans- photosynthesis
at what point of the vine growing cycle is water stress not desired? Ans- late stages
of shoot growth (can affect photosynthesis)
what can stunted shoot growth lead to? Ans- - weak shoots
- reduction in leaf number/smaller leaves
- inflorescences that do not flower properly
what can limit bud fruitfulness? Ans- - low temp (<25C)
- water stress
- shading
- nutrient deficiency
how long after budburst does flowering typically take place? Ans- 8 weeks (temp
dependent)
why are warm conditions (>17C) desired during flowering? Ans- speeds up flowering
(occurs within a few days)
what % of flowers become grapes typically? Ans- 30%
what temp does pollen germination require? Ans- 26-32C
what negatively affects pollen tube growth? Ans- wind, rain, cold temps; wind, water
stress, hot temps
define coulure Ans- A condition of the grape bunch in which fruit set has failed for a
high proportion of flowers. This occurs when ovule fertilisation is unsuccessful, and
therefore no grape develops.
what causes coulure? Ans- imbalance in carb levels due to:
- low photosynthesis rates
- vigorous shoot growth diverting carbs (very fertile soils, vigorous rootstocks)
define millerandange Ans- A condition of the grape bunch in which there is a high
proportion of seedless grapes.
The benefits of buying summaries with Stuvia:
Guaranteed quality through customer reviews
Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.
Quick and easy check-out
You can quickly pay through credit card or Stuvia-credit for the summaries. There is no membership needed.
Focus on what matters
Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!
Frequently asked questions
What do I get when I buy this document?
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
Satisfaction guarantee: how does it work?
Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.
Who am I buying these notes from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller Wiseman. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $18.49. You're not tied to anything after your purchase.
Can Stuvia be trusted?
4.6 stars on Google & Trustpilot (+1000 reviews)
83637 documents were sold in the last 30 days
Founded in 2010, the go-to place to buy study notes for 14 years now