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Coulure (pronounced coo-LYUR) is a viticultural hazard that is the result of metabolic reactions to weather conditions that causes a failure of grapes to develop after flowering. In English the word shatter is sometimes used. Coulure is triggered by periods of cold, cloudy, rainy weather or very high out-of-season temperatures. The condition is most often manifested in the spring. It also occurs in vines that have little sugar content in their tissue. Flowers stay closed and are not fertilized. Thus the vines are not pollinated as the grape fails to develop and falls off. Coulure can also cause irregular bunches of grapes which are less compact than normal. These bunches are more sensitive to developing various grape diseases. The yield of a vine with coulure will decrease substantially. G

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  • Verrieselung (Weinbau) (de)
  • Coulure (en)
  • Coulure (fr)
  • Coulure (it)
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  • En arboriculture fruitière et en viticulture, la coulure est la chute des fleurs ou des jeunes fruits. (fr)
  • Bei der Verrieselung im Weinbau werden ungewöhnlich viele Blüten oder kleine Beeren vom Stielgerüst abgestoßen. Normalerweise liegt der Anteil der Blüten, die sich zu Beeren entwickeln, je nach Rebsorte bei lediglich 30 bis 60 Prozent (= Durchblührate). Dies ist normal, da die Rebe unmöglich alle Früchte zur Vollreife bringen könnte. Die Verrieselung ist eine Befruchtungsstörung und zählt damit zur Familie der physiologischen Störungen der Weinrebe. Die Befruchtungsstörung kann bis ca. 3 Wochen nach der Blüte auftreten. Häufig spielen die klimatischen Bedingungen während dieser Zeit eine wichtige Rolle. Als Resultat der Verrieselung kommt es zu und damit zu einer Ertragsminderung. Einige Rebsorten wie Grenache, Malbec, Merlot aber auch Ortega und Muskat-Ottonel neigen verstärkt zum Verrie (de)
  • Coulure (pronounced coo-LYUR) is a viticultural hazard that is the result of metabolic reactions to weather conditions that causes a failure of grapes to develop after flowering. In English the word shatter is sometimes used. Coulure is triggered by periods of cold, cloudy, rainy weather or very high out-of-season temperatures. The condition is most often manifested in the spring. It also occurs in vines that have little sugar content in their tissue. Flowers stay closed and are not fertilized. Thus the vines are not pollinated as the grape fails to develop and falls off. Coulure can also cause irregular bunches of grapes which are less compact than normal. These bunches are more sensitive to developing various grape diseases. The yield of a vine with coulure will decrease substantially. G (en)
  • Coulure è un termine della lingua francese utilizzato per designare un rischio per la viticoltura risultante dalle reazioni metaboliche a determinate condizioni meteorologiche che causano il mancato sviluppo dell'uva dopo la fioritura. In inglese a volte viene usata la parola shatter. La coulure viene provocata da periodi di freddo, da un clima nuvoloso, tempo piovoso o temperature fuori stagione molto elevate. La condizione si manifesta più spesso in primavera. Si verifica anche nelle viti che hanno poco contenuto di zucchero nei loro tessuti. I fiori rimangono chiusi e non vengono fecondati. Pertanto le viti non vengono impollinate poiché l'uva non si sviluppa e cade. La coulure può anche causare grappoli d'uva irregolari e meno compatti del normale. Questi grappoli sono più sensibili al (it)
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  • http://commons.wikimedia.org/wiki/Special:FilePath/Coulure_2014_P7053002_bew.jpg
  • http://commons.wikimedia.org/wiki/Special:FilePath/Young_grapes.jpg
  • http://commons.wikimedia.org/wiki/Special:FilePath/Grapes03.jpg
  • http://commons.wikimedia.org/wiki/Special:FilePath/Malbec_grapes.jpg
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  • Coulure (pronounced coo-LYUR) is a viticultural hazard that is the result of metabolic reactions to weather conditions that causes a failure of grapes to develop after flowering. In English the word shatter is sometimes used. Coulure is triggered by periods of cold, cloudy, rainy weather or very high out-of-season temperatures. The condition is most often manifested in the spring. It also occurs in vines that have little sugar content in their tissue. Flowers stay closed and are not fertilized. Thus the vines are not pollinated as the grape fails to develop and falls off. Coulure can also cause irregular bunches of grapes which are less compact than normal. These bunches are more sensitive to developing various grape diseases. The yield of a vine with coulure will decrease substantially. Grape varieties with high proclivity to coulure are Grenache, Malbec, Merlot, and Muscat Ottonel. Other causes of coulure may be vineyard conditions and practices, pruning too early or too severely, excessively fertile soils or overuse of fertilizers, and improper selection of rootstocks or clones. During the flowering part of the growing season (May-June in the Northern Hemisphere, November-December in the Southern Hemisphere), grapevines often need dry conditions with sufficient sunlight and ambient air temperature around 15 °C (59 °F) for pollination to go smoothly. Less ideal conditions, particularly wet, rainy weather, increases the odds that a higher than normal numbers of flowers go unpollinated and coulure to occur. Coulure is a distinct phenomena unrelated to another viticultural hazard, millerandage, where the flowers are pollinated but the resulting berries develop without seeds and remain small. Like coulure, millerandage is often caused by inclement weather during the flowering and fruit set period and cause reduced yields. (en)
  • Bei der Verrieselung im Weinbau werden ungewöhnlich viele Blüten oder kleine Beeren vom Stielgerüst abgestoßen. Normalerweise liegt der Anteil der Blüten, die sich zu Beeren entwickeln, je nach Rebsorte bei lediglich 30 bis 60 Prozent (= Durchblührate). Dies ist normal, da die Rebe unmöglich alle Früchte zur Vollreife bringen könnte. Die Verrieselung ist eine Befruchtungsstörung und zählt damit zur Familie der physiologischen Störungen der Weinrebe. Die Befruchtungsstörung kann bis ca. 3 Wochen nach der Blüte auftreten. Häufig spielen die klimatischen Bedingungen während dieser Zeit eine wichtige Rolle. Als Resultat der Verrieselung kommt es zu und damit zu einer Ertragsminderung. Einige Rebsorten wie Grenache, Malbec, Merlot aber auch Ortega und Muskat-Ottonel neigen verstärkt zum Verrieseln. (de)
  • En arboriculture fruitière et en viticulture, la coulure est la chute des fleurs ou des jeunes fruits. (fr)
  • Coulure è un termine della lingua francese utilizzato per designare un rischio per la viticoltura risultante dalle reazioni metaboliche a determinate condizioni meteorologiche che causano il mancato sviluppo dell'uva dopo la fioritura. In inglese a volte viene usata la parola shatter. La coulure viene provocata da periodi di freddo, da un clima nuvoloso, tempo piovoso o temperature fuori stagione molto elevate. La condizione si manifesta più spesso in primavera. Si verifica anche nelle viti che hanno poco contenuto di zucchero nei loro tessuti. I fiori rimangono chiusi e non vengono fecondati. Pertanto le viti non vengono impollinate poiché l'uva non si sviluppa e cade. La coulure può anche causare grappoli d'uva irregolari e meno compatti del normale. Questi grappoli sono più sensibili allo sviluppo di varie malattie dell'uva. La produttività di una vite affetta da coulure diminuirà sostanzialmente. Le varietà di uve con alta propensione ad essere intaccate da coulure sono Grenache, Malbec, Merlot e . Altre cause di coulure possono essere le condizioni della vigna o pratiche sconsiderate tra cui la potatura troppo precoce o troppo incisiva, i terreni eccessivamente fertili o l'uso eccessivo di fertilizzanti e la selezione impropria degli innesti. Durante la fioritura nella stagione di crescita (maggio-giugno nell'emisfero boreale, novembre-dicembre nell'emisfero australe), le viti spesso hanno bisogno di condizioni di suolo asciutto con adeguata luce solare e temperatura ambientale intorno a 15 °C (59 °F). Condizioni meno favorevoli, in particolare tempo piovoso e umido, aumentano le probabilità che un numero di fiori superiore al normale non venga impollinato e che si verifichi della coulure . La coulure è un fenomeno distinto non correlato ad un differente rischio viticulturale, il millerandage, in cui i fiori sono impollinati ma le bacche risultanti si sviluppano con i semi e rimangono piccole. Come la coulure, il millerandage è spesso causato da condizioni meteorologiche avverse durante il periodo di fioritura e fruttificazione e causa una resa ridotta. (it)
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