Viticulture

Question 1

What is the scientific name for the grape vine

Answer 1

Vitis Vinifera

Question 2

What is the vine life cycle

Answer 2

Feb: Weeping/Bleeding
March-April: Budbreak
Mid-April: Embryo
June-July: Flowering
August: Véraison
Late August: Vendage

Question 3

At what average temperature do vine emerge from dormancy

Answer 3

50°F

Question 4

When are vines most susceptible to frost

Answer 4

During budbreak and flowering

Question 5

Define fruitset

Answer 5

self-pollinated embryos turn to grapes; usually about 30%

Question 6

Define shatter

Answer 6

the pollinated embryos that fall to the ground; usually 70%

Question 7

Define véraison

Answer 7

When the grape skins soften and change color, acid falls, and sugars increase

Question 8

What is the ideal mean temperature for vines

Answer 8

50°F-68°F, ideally 57°F

Question 9

What is the required average summer temperature for red grapes to ripen

Answer 9

70°F

Question 10

What is the required average summer temperature for white grapes to ripen

Answer 10

66°F

Question 11

Between what latitudes do grapes generally prefer to grow.

Answer 11

between 30° and 50°

Question 12

Define the California Heat Summation Index

Answer 12

This scale divides climates into five Regions based on the number of degree days. Degree days are calculated by multiplying the days in each month of the growing season (defined as April 1 through October 31) by the mean number of degrees over 50°F for that month