Shoot and Leaf Growth

Question 1

When is shoot and leaf growth in the Northern hemisphere?

Answer 1

March to July (3-7)

Question 2

When is shoot and leaf growth in the Southern hemisphere?

Answer 2

September to January (9-10)

Question 3

What is shoot and leaf growth?

Answer 3

When the shoots continue to grow, and leaves and inflorescences mature

Question 4

When does the fastest rate of shoot and leaf growth occur?

Answer 4

The fastest rate of growth generally occurs between budburst and flowering

Question 5

What initially supports shoot growth?

Answer 5

Carbohydrates store in the roots, trunk, and branches of the vine support initial growth

Question 6

What supports shoot growth later in the season?

Answer 6

-as leaves develop and mature, they provide energy for further growth via photosynthesis, and therefore need adequate warmth and sunlight for this to take place

Question 7

What four factors contribute to low carbohydrate levels?

Answer 7

Excessive leaf removal

Water stress

Mildew infections

High crop loads in the previous season

Question 8

What main problem can occur during shoot and leaf growth?

Answer 8

Water stress

• can limit photosynthesis and shoot growth
• can limit nutrient uptake through the roots

Question 9

What does stunted shoot growth lead to?

Answer 9

• small, weak shoots
• a reduction in leaf number or smaller leaves
• inflorescences that do not flower properly
• grape bunches that do not ripen fully
• poor quality
• lower yields

Question 10

What does a Vine need during the shoot and leaf growth stage?

Answer 10

1. stored carbs
2. warmth
3. sunlight
4. nutrients
5. water