4. Viticulture Flashcards
Approximately how many acres of grapevines are there worldwide?
What percent of these are used for wine production?
19M Acres (7.7 Ha)
Producing 70M tons of grapes
70% goes to wine
What is the greenery of a vine called?
Its canopy
What is field grafting?
Field grafting is a method of retaining healthy rootstock for a new variety of grapes.
Weeping begins when the ground temperatures rise above _____ F.
50 F
(10 C)
Weeping lasts only a day or two before bud break.
What happens during bud break?
Buds emerge from the nodes of a vine’s branches.
Budbreak occurs 1-2 days after weeping begins.
When does Flowering occur?
Roughly 40-80 days post bud break.
What happens during Flowering?
Flowering occurs 40-80 days after bud break when clusters of tiny flowers appear at intervals along the shoots.
Vinifera grapevines are self pollinating.
What does that mean?
Insects are not necessary for fertilization, the breeze blows pollen from one part of the plant to another.
What is the ideal weather conditions during flowering?
Warm, dry conditions, with a light breeze to allow the pollen to reach its destination.
Rain and excessive wind can results in fewer grapes and a smaller crop.
What is Fruit Set?
Fruit Set (or berry set) occurs when the flower transitions to a berry (grape).
What is coulure?
Coulure (Shatter) is the term for poor fruit set, where pollen transfer does not occur at the levels it should.
Millerandage refers to abnormal fruit set, typically caused by bad weather, where a high proportion of berries are small and seedless.
What is shatter?
Shatter (Coulure) is an issue where flowers fail to become berries due to issues with fertilization.
What is Millerandage?
Millerandage refers to abnormal fruit set - producing “hen and chicken” berries.
