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Quassia, an Effective Aphid Control Agent for Organic Hop Growing

Weihrauch, Florian; Schwarz, Johannes and Engelhard, Bernhard (2008) Quassia, an Effective Aphid Control Agent for Organic Hop Growing. Poster at: Cultivating the Future Based on Science: 2nd Conference of the International Society of Organic Agriculture Research ISOFAR, Modena, Italy, June 18-20, 2008.

[thumbnail of Weihrauch_11550_ed.doc] RTF (Rich Text Format) - German/Deutsch


In the first three decades of the 20th century, quassia extract was widely used in hop growing as a chemical agent to control Phorodon humuli and other insect pests. In the first years of the 21st century this compound was rediscovered by German organic hop growers. In several efficacy trials conducted during five field seasons, quassia pro¬ducts proved to be effective control agents for P. humuli in organically grown aroma cultivars. A systemic variant developed by painting a suspension of quassia extract to the bines was the best method of application. This method proved not only to be very effective, but was also best from an environmental point of view. The optimal systemic application rate was determined as 24 g/ha of the active ingredient quassin. In order to generate the data necessary for registration of quassin in Annex I of the EU Council Directive 91/414/EEC, further efficacy trials were conducted during 2007. The results emphasize the importance of this compound as currently the only suitable aphid control agent in organic hop growing, especially when applied systemically.

EPrint Type:Conference paper, poster, etc.
Type of presentation:Poster
Keywords:Hop, Humulus lupulus, Phorodon humuli, plant protection, quassia, BÖL, BOEL, FKZ 03OE483
Subjects: Crop husbandry > Crop health, quality, protection
Research affiliation: Germany > Federal Organic Farming Scheme - BOELN > Plants > Pflanzenschutz
Germany > Federal States > Bavaria > State research centre agriculture
International Conferences > 2008: IFOAM OWC: Research Track / ISOFAR > 2.6 Crop health and weed management
Related Links:http://www.bundesprogramm-oekolandbau.de, http://www.bundesprogramm.de/fkz=03OE483, https://orgprints.org/perl/search/advanced?addtitle%2Ftitle=&keywords=03OE483&projects=BOEL&_order=bypublication&_action_search=Suchen
Deposited By: Weihrauch, Dr. Florian
ID Code:11550
Deposited On:06 Oct 2008
Last Modified:12 Apr 2010 07:35
Document Language:English
Refereed:Peer-reviewed and accepted
Additional Publishing Information:This paper is published in the conference proceedings:
Neuhoff, Daniel; Halberg, Niels; Alfldi, Thomas; Lockeretz, William; Thommen, Andreas; Rasmussen, Ilse A.; Hermansen, John; Vaarst, Mette; Lck, Lorna; Carporali, Fabio; Jensen, Henning Hgh; Migliorini, Paola and Willer, Helga, Eds. (2008) .Cultivating the Future Based on Science. Proceedings of the Second Scientific Conference of the International Society of Organic Agriculture Research (ISOFAR), held at the 16th IFOAM Organic World Congress in Cooperation with the International Federation of Organic Agriculture Movements (IFOAM) and the Consorzio ModenaBio, 18 . 20 June 2008 in Modena, Italy.. International Society of Organic Agriculture Research (ISOFAR), c/o IOL, DE-Bonn, Research Institute of Organic Agriculture FiBL, CH-Frick. https://orgprints.org/13672 and https://orgprints.org/13674

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