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

Gibberelline - 3 stages of a plant with no, moderate and a lot of Gibberellins

Especially seedless Varieties respond, such as the Sultana, This has also been common in fruit growing for some time. For several years there have been intensive attempts to use gibberellins in viticulture. The goal is lockerbeerigegrapes to obtain. This could be an alternative to the very time-consuming and labor-intensive manual process thin out his. In addition, looseness increases the risk of Botrytis and others fungal diseases greatly reduced. That would be especially the case with narrow-berry red wine varieties such as St. Laurent or Pinot Noir advantageous. A disadvantage of the significantly larger berries is an unfavorable ratio of juice to berry skin. In the graphic, the effect is 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 respectively. 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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