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growth regulating Phytohormon (Plant hormone), which was discovered in 1926 in Japan has been discovered. At that time, a rice disease was known, which was known in Japan under the name "crazy rice seedlings". Among other things, the plants grow extremely fast. As a cause or this process triggering messenger substance could make a substance that is excreted by a fungus parasitizing on the plants (Gibberella fujikuroi). In 1956, it was then possible to isolate a gibberellin from plants, today we know about 110 different species. Also at Rebstock are such hormones in their natural form in the roots, Scroll and berry seeds available. This controls growth, seed formation and germination. Since the 1970s gibberellins are used in the production of table grapes used. These will be during the blossom and sprinkled shortly afterwards with gibberellin to produce fewer but larger berries.

Gibberelline - 3 stages of a plant with no, moderate and much gibberellins

Especially seedless Varieties respond, such as the Sultana, This has also been common practice in fruit growing for some time. For some years there have been intensive attempts to use gibberellins in viticulture. The goal is to lockerbeerigegrapes to obtain. This could be an alternative to the very manual and labor intensive manual thin out his. In addition, the risk of being bowed is a factor of Botrytis and others fungal diseases greatly reduced. That would be especially true for narrow-grape red wines like St. Laurent or Pinot Noir advantageous. A disadvantage of the much larger berries is a less favorable ratio of juice to berry skin. In the graph, the effect becomes different depending on the amount of gibberellin Inter Nodien and flower sizes shown. Plant hormones such as gibberellin belong to the large group of Plant strengtheners as part of a gentle pest Management or. Organic (Ecological) viticulture,

Graphics: By Lee Spahr - Own Work, CC BY-SA 3.0 , Link
edited by Norbert Tischelmayer January 2019

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