WSET DIPLOMA D1 EXAM WITH CORRECT
ACTUAL QUESTIONS AND CORRECTLY
WELL DEFINED ANSWERS LATEST
ALREADY GRADED A+
when does the fastest rate of shoot growth typically occur?
between budburst and flowering
what could cause low carb levels in roots, trunk, and
branches?
- excessive leaf removal
- water stress
- mildew
- high crop loads in prev season
what can slow initial shoot growth rates?
low carb levels
what supports shoot growth in later stages?
photosynthesis
at what point of the vine growing cycle is water stress not
desired?
,late stages of shoot growth (can affect photosynthesis)
what can stunted shoot growth lead to?
- weak shoots
- reduction in leaf number/smaller leaves
- inflorescences that do not flower properly
what can limit bud fruitfulness?
- low temp (<25C)
- water stress
- shading
- nutrient deficiency
how long after budburst does flowering typically take place?
8 weeks (temp dependent)
why are warm conditions (>17C) desired during flowering?
speeds up flowering (occurs within a few days)
what % of flowers become grapes typically?
30%
what temp does pollen germination require?
26-32C
what negatively affects pollen tube growth?
wind, rain, cold temps; wind, water stress, hot temps
define coulure
,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?
imbalance in carb levels due to:
- low photosynthesis rates
- vigorous shoot growth diverting carbs (very fertile soils,
vigorous rootstocks)
define millerandange
A condition of the grape bunch in which there is a high
proportion of seedless grapes.
what causes millerandange?
cold, wet, windy weather at pollination and fruit set
what elements develop in grapes during stage 1 of grape
formation and development?
- tartaric and malic
- some aroma compounds and aroma precursors
(methoxypyrazines)
- tannins (promoted by sunshine on grapes - sunscreen)
during stage 1 of grape formation and development sugar
levels are ______, water flow is _______ & provided by the
________.
, - low
- high
- xylem
too much _________ & __________ can prolong stage 1 of
grape formation and development because _____________.
this can delay _____________.
- water
- nitrogen
- these will encourage shoot growth instead
- onset of the ripening stage
During stage 1 of grape formation and development, mild
water stress can ___________________ and lead to the
production of _______________ grapes.
- speed up this stage
- smaller
shoot growth _______________ during stage 1 of grape
formation and development.
continues but slows
what is stage 2 of grape formation and development?
veraison (transition between grape growth and grape
ripening)
what is the lag phase?
grape growth slows for a few days during veraison
describe what happens during veraison
ACTUAL QUESTIONS AND CORRECTLY
WELL DEFINED ANSWERS LATEST
ALREADY GRADED A+
when does the fastest rate of shoot growth typically occur?
between budburst and flowering
what could cause low carb levels in roots, trunk, and
branches?
- excessive leaf removal
- water stress
- mildew
- high crop loads in prev season
what can slow initial shoot growth rates?
low carb levels
what supports shoot growth in later stages?
photosynthesis
at what point of the vine growing cycle is water stress not
desired?
,late stages of shoot growth (can affect photosynthesis)
what can stunted shoot growth lead to?
- weak shoots
- reduction in leaf number/smaller leaves
- inflorescences that do not flower properly
what can limit bud fruitfulness?
- low temp (<25C)
- water stress
- shading
- nutrient deficiency
how long after budburst does flowering typically take place?
8 weeks (temp dependent)
why are warm conditions (>17C) desired during flowering?
speeds up flowering (occurs within a few days)
what % of flowers become grapes typically?
30%
what temp does pollen germination require?
26-32C
what negatively affects pollen tube growth?
wind, rain, cold temps; wind, water stress, hot temps
define coulure
,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?
imbalance in carb levels due to:
- low photosynthesis rates
- vigorous shoot growth diverting carbs (very fertile soils,
vigorous rootstocks)
define millerandange
A condition of the grape bunch in which there is a high
proportion of seedless grapes.
what causes millerandange?
cold, wet, windy weather at pollination and fruit set
what elements develop in grapes during stage 1 of grape
formation and development?
- tartaric and malic
- some aroma compounds and aroma precursors
(methoxypyrazines)
- tannins (promoted by sunshine on grapes - sunscreen)
during stage 1 of grape formation and development sugar
levels are ______, water flow is _______ & provided by the
________.
, - low
- high
- xylem
too much _________ & __________ can prolong stage 1 of
grape formation and development because _____________.
this can delay _____________.
- water
- nitrogen
- these will encourage shoot growth instead
- onset of the ripening stage
During stage 1 of grape formation and development, mild
water stress can ___________________ and lead to the
production of _______________ grapes.
- speed up this stage
- smaller
shoot growth _______________ during stage 1 of grape
formation and development.
continues but slows
what is stage 2 of grape formation and development?
veraison (transition between grape growth and grape
ripening)
what is the lag phase?
grape growth slows for a few days during veraison
describe what happens during veraison
