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Apple scab control with grapefruit seed extract: no alternative to chemical fungicides

Spitaler, Renate; Marschall, Klaus; Zidorn, Christian; Kelderer, Markus; Zelger, Roland and Stuppner, Hermann (2004) Apple scab control with grapefruit seed extract: no alternative to chemical fungicides. In: Boos, Markus (Ed.) Ecofruit - 11th International Conference on Cultivation Technique and Phytopathological Problems in Organic Fruit-Growing: Proceedings to the Conference from 3rd February to 5th February 2004 at Weinsberg/Germany, pp. 208-211.

[thumbnail of 39_Kelderer_208_211.pdf] PDF - German/Deutsch


The growth inhibiting effect of four commercially available grapefruit seed extracts
on the causal organism of apple scab Venturia inaequalis was tested. Germination of
the conidia of Venturia inaequalis was pronouncedly inhibited by all tested extracts.
The commercial products were analyzed by high pressure liquid chromatography and
thin layer chromatography. All samples contained at least one preserving agent.
These substances were identified as either benzethonium chloride, benzalkonium
chloride, methyl parabene or propyl parabene. Freshly prepared extracts from seeds
of grapefruits (Citrus paradisi) did not inhibit the germination of Venturia inaequalis. It
was therefore concluded that the antifungal effect of grapefruit seed extracts is
caused by the added preservatives.

EPrint Type:Conference paper, poster, etc.
Type of presentation:Paper
Keywords:apple scab, Venturia inaequalis, grapefruit seed extract, preserving agents, benzethonium chloride, benzalkonium chloride, methyl parabene, propyl parabene.
Subjects: Crop husbandry > Crop health, quality, protection
Crop husbandry > Production systems > Fruit and berries
Research affiliation: International Conferences > 2006: Ecofruit
Related Links:http://www.ecofruit.net
Deposited By: Tagung, Ecofruit
ID Code:14543
Deposited On:18 Sep 2008
Last Modified:12 Apr 2010 07:38
Document Language:English
Refereed:Peer-reviewed and accepted

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