Affects vines when air temperatures are high. Very high daytime temperatures, of more than 40°C/104°F, cause the vine to "shut down", or virtually cease photosynthesis, as the enzymes responsible can no longer work. High temperatures also lead to water stress, especially when accompained by bright sunshine, low humidity, and strong, dry winds.
Common winemaking practice, named after its French promulgator Jean-Antoine Chaptal, whereby the final alcoholic strength of a wine is increased by addition of sugar to the grape juice or must, before and/or during fermentation, although if it is added before, the higher sugar level will make it harder for the yeast to multiply.
The result of breeding a new variety by crossing two vine varieties. If the varieties are of the same species, usually the European vinifera species, then the result may also be knowm a an intraspecific cross - Müller-Thurgau would be one example.
French for "white of whites", may justifiably be used to describe white wines made from pale-skinned grapes. As the great majority of them are. A real significance only when used for white sparkling wines.
Italian term meaning literally "repassed", for the technique of adding extra flavour, and alcohol, to Valpolicella by refermenting the young wine on the unpressed skins of Amarone wines after these dried-grape wines have finished their fermentation in the spring, and racked off.
The general term used by winemakers to describe the harmless crystalline deposits that separate from wines during fermentation and ageing. The principal component of this deposit is potassium acid tartrate, the potassium salt of tartaric acid, which has therefore given rise to the name.
The most famous northern Rhône appellation of all, producing extremely limited quantities of seriously long-lived reds and about a third as much full-bodied dry white wine which some believe is even more distinguished. Hermitage was one of France's most famous wines in the 18th and 19th centuries when the name alone was sufficient to justify prices higher than any wine other than a first growth bordeaux.
Sometimes simply as botrytis, is the benevolent form of botrytis bunch rot, in which the Botrytis cinerea fungus attacks ripe, undamaged white wine grapes and, given the right weather, can result in extremely sweet grapes.
The most valuable category of white wines made from the ripest grapes on the best sites of the Wachau in Austria. The category is named after the green lizard that basks in the sun on the Wachau's steep stone terraces above the river Danube. Alcohol levels in the unchaptalized Grüner Veltliners and Rieslings that qualify must be more than 12.5%.
Of a wine is ist total concentration of volatile acids, those naturally occuring organic acids of wines that are separable by distillation. Wine's most common volatile acid by far is acetic acid (more than 96%).
Nebulous Italian term usually denoting a wine given extended ageing before release, and suggesting a higher quality, and a higher percentage of alcohol than the normal version of the same wine. The ageing requirement for Riservas varies from DOC to DOC, but normally is a minimum of one year, up to 62 months for Barolo Riserva. In many cases this must include a period in cask, aswell as in bottle.
Is a term used particularly in Burgundy for wine which qualifies for an appellation that coincides with the name of the village or commune in which the wine is made.
Or insert, planks of wood, usually oak, placed in a stainless steel tank and held in position by a metal framework, are a way of imparting oak flavour to wine more cheaply than by fermenting or ageing in barrels since the staves are easily replaced.
The connection of two pieces of living plant tissue so that they unite and grow as one plant, has been a particularly important element in growing vines since the end of the 19th century.
Direct Anglicization of the German Eiswein, sweet wine made from ripe grapes picked when frozen on the vine and pressed so that water crystals remain in the press and the sugar content of the resulting wine is increased. This sort of true ice wine is a speciality of Canada, where it is written Icewine. The word Icewine has been trademarked by VQA Canada which imposes the world's most stringent standards on the production. In Ontario, grapes for Icewine must have reached alt least 35° Brix. Residual sugar at bottling must be at least 125 g/l.
