Growing Environment

Question 1

What is the optimum range for photosynthesis?

Answer 1

64-91°F

- Due to this wide range, temperature is usually not a limiting factor

Question 2

Warm temperatures above ____ promote successful, uniform flowering

Answer 2

17/63

Question 3

What is the optimum range for fruit set?

Answer 3

26-32/79-90

Question 4

How does temperature affect sugar accumulation in the grapes?

Answer 4

Warm temperatures will help speed up photosynthesis to produce the sugars, and transpiration in the grape will also be higher promoting the movement of sugar into the grape.

Question 5

What is the problem with flavor development in cooler climates?

Answer 5

Cooler conditions hinder the break down of methoxypyrazines which gives off herbaceous aromas

Question 6

What is worse for photosynthesis, a cloudy day or fog?

Answer 6

Fog! Thick fog will impact the rate of photosynthesis as long as light levels do not drop below 1/3 of full sunshine

Question 7

How does sunshine affect tannins in black grape varietals?

Answer 7

Leads to greater accumulation pre-verasion and promotes tannin polymerisation after verasion.

Question 8

What is a side-effect of to much sunshine on the grapes?

Answer 8

Sunburn on the grape skins