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Süßholz (Glycyrrhiza glabra) - Extrakt zur Regulierung von Falschem Mehltau im Öko-Gemüseanbau

Schmitt, Annegret; Scherf, Andrea; Schuster, Christina; Gärber, Ute; Marx, Peggy; Idczak, Elke; Rupp, Jochen; Leinhos, Gabriele and Konstantinidou-Doltsinis†, Stavroula (2011) Süßholz (Glycyrrhiza glabra) - Extrakt zur Regulierung von Falschem Mehltau im Öko-Gemüseanbau. [Licorice (Glyzyrrhiza glabra) extract for control of downy mildew in organic vegetable production.] Paper at: 11. Wissenschaftstagung Ökologischer Landbau, Gießen, 16.-18. März 2011.

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Summary

A raw extract of licorice (Glycyrrhiza glabra) was tested against downy mildew in vegetables under semi-commercial conditions. In two greenhouse trials in cucumber, efficacies of ca. 70% were achieved (3% extract concentration) in either 7 or 10-11 day application intervals. Under open field conditions, weekly treatments resulted in ca. 2 week retardation of disease. In open field trials in lettuce, efficacies after weekly application of 5% G. glabra extract were variable, depending on disease pressure. In contrast, on lettuce seedlings in climate chambers, the extract reduced disease incidence of Bremia lactucae by 66 to 100%. In onion, applications of the extract at 6% concentration failed to control Peronospora destructor, despite of high efficacies under controlled conditions in the greenhouse. Overall, the G. glabra raw extract was highly effective in protected vegetables. Under field conditions low efficacies were most likely due to reduced rain fastness or UV-stability.


EPrint Type:Conference paper, poster, etc.
Type of presentation:Paper
Keywords:Gurke, Zwiebel, Salat, Pflanzenextrakte
Subjects: Crop husbandry > Crop health, quality, protection
Research affiliation: Germany > Federal States > Rheinland-Pfalz > DLR
Germany > Bioland
Germany > Federal Research Centre for Cultivated Plants - JKI > Institute for Biological Control
Germany > Federal Research Centre for Cultivated Plants - JKI > Institute for Plant Protection in Horticulture and Forests
International Conferences > 2011: Scientific Conference on Organic Agriculture
Related Links:http://www.wissenschaftstagung.de/, http://www.verlag-koester.de/buch.php?id=735&suche=11.%20wissenschaftstagung&fb_id=s
Deposited By: Schmitt, Dr. Annegret
ID Code:17759
Deposited On:21 Jun 2011 12:22
Last Modified:21 Jun 2011 12:22
Document Language:German - Deutsch
Status:Published
Refereed:Peer-reviewed and accepted
Additional Publishing Information:Dieser Beitrag ist im Tagungsbandes der 11. Wissenschaftstagung erschienen.
Leithold, G.; Becker, K.; Brock, C.; Fischinger, S.; Spiegel, A.-K.; Spory, K.; Wilbois, K.-P. und Williges, U. (Hrsg.) (2011):
Es geht ums Ganze: Forschen im Dialog von Wissenschaft und Praxis
Beiträge zur 11. Wissenschaftstagung Ökologischer Landbau, Justus-Liebig-Universität Gießen, 15.-18. März 2011
Band 1: Boden, Pflanze, Umwelt, Lebensmittel und Produktqualität
Band 2: Tierproduktion, Sozioökonomie
Verlag Dr. Köster, Berlin.
Der Tagungsband kann über den Verlag Dr. Köster bezogen werden; siehe: http://verlag-koester.de/buch.php?id=735&fb_id=37

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