Flashcards in Viti 2: The Vine Deck (58)
Family to which Vitis Vinifera belongs
Vitaceae (family of woody climbing plants)
Buds that break in the same year as their formation
Buds that break in the spring in the spring that follows their formation
The process by which leaves evaporate water, in turn enabling the plant to suck up water from the soil
Leaf stalks. Can be analysed to determine nutrient requirements of the vine.
Grouped bunches called inflorescences and are hermaphroditic.
Carbohydrates stored in roots throughout winter return to the trunk and canes as sap to give nutrients.
Leaves fall off and shoots lignify (harden and brown).
Poor set brought about by poor light levels.
Millerandage/hen and chicken:
Small berries with no seeds and big berries with seeds all on same bunch brought about by low temperatures.
Vieilles vignes in German:
Hybridisation between species:
Wild on river banks in alluvial soil, central-eastern N America. Phylloxera resistant, grafts well, low in vigour, ripen early, but suffer chlorosis (iron deficiency) in chalky soils. Good for controlling vigour. Rootstocks tolerant of damp.
Found on chalky slopes in southern USA and Mexico. Vigorous, deep-rooted and resists chlorosis. Cuttings don't root well, so often hybridised with riparia/rupestris. High calcium tolerance.
Introduction of downy mildew in Europe from USA
Name of downy mildew
PDO wines in Europe
Cannot be hybrid
Crosses occurring within same species (one variety with another):
Intraspecific vinifera crosses
Louis Bouschet - Aramon x Teinturier =
Henri Bouschet (son) - Petit Bouschet x Grenache =
Alicante Bouschet (rich in anthocyanins in pulp and skin, deep red).
Group name for anthocyanin-rich black grapes:
Hermann Müller (from Thurgau, Switzerland) in late C19th
Riesling x Madeleine Royale (table grape) = Müller Thurgau
Mass selection/sélection massale:
Marking out best plants from which to take cuttings. Best done in poor years and involves eliminating plants rather than actively selecting them.
Come from single parent and have same genetic identity. Propagated vegetatively. First carried out in 1876. Risks high yields and easy spread of disease.
Why are Vitis berlandieri and rotundifolia layered rather than rooted from cuttings?
They respond better to layering rather than rooting from cuttings.
Only suitable for areas with no phylloxera risk. Famous example: Bollinger's Vieilles Vignes Françaises.
Hardwood winter cuttings normally used. Taken in autumn/winter when carbohydrates are highest and is healthy. Softwood harder to propagate, but available all year round.
Length and treatment of cuttings:
30-45cm pieces. Stored at 5 degrees. Heat treatment at 50 degrees for 30 minutes and kills pests, phylloxera, nematodes and phytoplasmas.
Plenty of water, as leaves grow faster than roots (mist propagation/propagating frame). Warmth (15-25 degrees) from below, if possible, to encourage roots. Loose, well-drained soil protected from vine weevils.