WSET Diploma D1 - viticulture

Question 1

Timing & average temperature for budburst

Answer 1

March-April, 10°C

Question 2

Average temperature for budburst on Merlot

Answer 2

Just under 10°C

Question 3

Average temperature for budburst on Ugni Blanc

Answer 3

Just over 10°C

Question 4

Budding/ripening on Grenache

Answer 4

Buds early, ripens late

Question 5

Early- or late-budding: Chardonnay, Pinot Noir, Merlot, Grenache?

Answer 5

Early

Question 6

Early- or late-budding: Sauvignon Blanc, Cabernet Sauvignon, Syrah?

Answer 6

Late

Question 7

Characteristics of clone PN115

Answer 7

Low yield, small grapes => high-quality red wine production

Question 8

Characteristics of clone PN521

Answer 8

Higher yield, bigger grapes => sparkling wine production

Question 9

Formula for photosynthesis

Answer 9

6CO2 + 6H2O + sunlight -> C6H12O6 (glucose) + 6O2

Question 10

Impact of drought on vine growth

Answer 10

• water stress limits photosynthesis
  => less energy (glucose) for growth
• dry soils impair nutrient uptake through roots
  => less nutrients available, e.g. for vine vigour (N), regulating water flow (K), chlorophyll/photosynthesis (N, P, Ca, Mg), root development (P) and cell structure (Ca)

Question 11

Timing & average temperature for flowering & fruit set

Answer 11

May-June, >= 17°C

Question 12

4 factors limiting bud fruitfulness

Answer 12

Shading
Temperatures < 25°C
Water stress
Nutrient deficiency

Question 13

Riesling: are buds fruitful at higher or lower temperatures than average (< 25°C)?

Answer 13

Good bud fruitfulness at lower temperatures => suited for cool climates

Question 14

Definition of flowering

Answer 14

Opening of individual flowers in inflorescence

Question 15

Definition of fruit set

Answer 15

Transition from flower to grape