Viticulture Flashcards
How many acres of grapevines are throughout the world?
19 million
How many tons of fruit are produced throughout the world?
70 million tons
What percentage of fruit produced become wine?
70%
What is the difference between winegrowing and viticulture?
Winegrowing refers to grapes to be used specifically for wine. Viticulture refers to all grapevines.
What do you call the beginning of a vines arms?
Spurs
A vine’s spurs develop into what?
Canes
A vine’s thick arms are also called what?
Cordons
The entire portion of the vine, including the fruit is called what?
The canopy
How does a young grape protect itself from damage?
It is camoflauged by being green, like the leaves and by having an acidic taste so not tasty to birds.
How do grape seeds spread naturally?
Via birds
Name the methods used for grape propagation?
Grafting and cloning
Describe field grafting.
Cutting a cane off of one vine and attaching it to the root of another vine.
How long does is usually take for a new vine to produce usable grapes?
3 years, or 3 leaves
How many years before a vine typically produces optimal quality grapes?
6 years.
How long can a grapevine produce grapes?
10 or more years.
Old vine refers to vines that are how old?
Usually 50, and more
What latitude is best for growing grapes?
30 - 50 degrees
Describe the ideal seasons for grapes to grow.
Long warm to hot days in summer and short cool to cold days in winter.
Bud break begins at what temperature?
50 F/ 10C
Photosynthesis begins upon the appearance of
Leaves
Flowering begins how many days after bud break?
40 - 80 days
What kind of weather is ideal for flowering?
warm & dry
How go grapevines pollinate?
breezes move the pollen into the flowers of the vine
The transitions between flower and fruit is called
Fruit set or berry set
What is coulure, or shatter?
Poor fruit set with many flowers failing to become berries
What is millerandage?
small berries mixed in with larger healthy berries.
Berries will grow for how long before veraison?
90 days
Veraison is most noticeable in red or white grapes?
Red
How long after veraison is harvest?
1 1/2 month to 2 months after veraison
What is meant by a grapes physiological maturity?
When the grape has developed it’s color and size, phenolic compounds are developed.
What are the metabolic processes of a grapevine?
Photosynthesis, respiration, transpiration and translocation
Photosynthesis depends primarly on what two things?
Sunshine & temperature
The conversion of carbon dioxide and water into sugar is called what?
Photosynthesis
Photosynthesis slows at what temperatures?
50F/10C and 95F/35C
Optimal sugar production occurs at what temperatures?
70F/20C and 85F/30C
Why is aspect important?
The grapes will receive more sunlight.
The rate of respiration doubles for every increase of what degrees of temperature?
18F
What is the ideal diurnal temperature range?
warm to hot days and cool to cold nights
The openings on the underside of leaves are know as
Stomata
What is transpiration and why is it important?
Transpiration is when water evaporates through the leaves.
The rate of transpiration is closely related to
The weather
The stomata also control the intake of
carbon dioxide
What is translocation?
The movement of materials within the plant from one part to another.
What metabolic process uses sugar and then uses malic acid for energy?
Respiration
The process of materials moved form one part of the plant to another is called
Translocation
The process of the vine converting CO2 and water into sugar is called
Photosynthesis
The process of the vine breaking down sugars and other compounds for energy is called
Respiration
The process of water evaporating through the stomata and cooling the vine is called
Transpiration
The greatest vineyard sites have what 2 things in common?
They regulate the water supply and the ground is not very fertile.
The biggest factor in vintage variation is
Weather