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Slaked lime against european fruit tree canker: efficacy and introduction into practice

Heijne, Bart; Jong, Peter Frans de; Wenneker, Marcel and Jansonius, Pieter Jans (2005) Slaked lime against european fruit tree canker: efficacy and introduction into practice. Paper at: Researching Sustainable Systems - International Scientific Conference on Organic Agriculture, Adelaide, Australia, September 21-23, 2005. [Unpublished]

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European fruit tree canker, caused by Nectria galligena, is a major disease in organic apple cultivation. No copper can be used in Denmark and the Netherlands to control the disease. Removal of cankers is the only remaining method to control the disease. Slaked lime (calcium hydroxide) was applied at 50 or 100 kg/ha three times during the leaf fall period to protect apple trees against the disease. Experiments under high inoculum pressure showed a reduction in newly formed cankers of 57, 35 and 60 % with respect to untreated for 3 years respectively. The chemical standard thiophanate-methyl further reduced the number of newly formed cankers by 99, 60 and 89 % with respect to untreated for these 3 years respectively in these experiments. These results showed that slaked lime was less efficacious than the chemical standard under these high inoculum pressure circumstances. Demonstration experiments showed an efficacy of 70 and 68 % for slaked lime and 62 and 62 % for the conventional standard (carbendazim and captan) with respect to untreated controls in 2 years respectively. The demonstration experiments, done in commercial orchards and under normal inoculum pressure, showed a similar efficacy as the conventional standard. It is concluded that the use of slaked lime to control European fruit tree canker can contribute to a more economic organic apple and pear production in temperate climate zones.

EPrint Type:Conference paper, poster, etc.
Type of presentation:Paper
Keywords:organic, apple, pear, Nectria galligena, calcium hydroxide
Subjects: Crop husbandry > Crop health, quality, protection
Research affiliation: International Conferences > 2005: 1st ISOFAR Conference > 2005: 1st ISOFAR Conference
Related Links:http://orgprints.org/4013/, http://www.isofar.org/adelaide2005, http://orgprints.org/view/projects/int-conf-isofar-2005.html
Deposited By: ISOFAR
ID Code:4355
Deposited On:03 Nov 2005
Last Modified:12 Apr 2010 07:30
Document Language:English
Refereed:Peer-reviewed and accepted
Additional Publishing Information:The paper presented here is the final paper submitted by the authors to the conference Researching Sustainable Systems.
The final edited papers are available with the following publication:
Köpke, Ulrich; Niggli, Urs; Neuhoff, Daniel; Cornish, Peter; Lockeretz, Willie und Willer, Helga, (Hrsg.) (2005) Researching Sustainable Systems. Proceedings of the First Scientific Conference of the International Society of Organic Agriculture Research (ISOFAR), Held in Cooperation with the International Federation of Organic Agriculture Movements (IFOAM) and the National Association for Sustainable Agriculture, Australia (NASAA), 21 – 23 September 2005, Adelaide Convention Centre, Adelaide, South Australia.. Research Institute of Organic Agriculture FiBL, CH-Frick, and International Society of Organic Agriculture Research (ISOFAR), c/o Institute of Organic Agriculture (IOL), DE-University of Bonn. http://orgprints.org/4013/
Distribution: Paper copies may be ordered from FiBL at a cost of 28 Euros plus mailing costs (see FiBL shop at http://www.fibl.org/shop); FiBL order number 1394. A PDF version is available free of charge for ISOFAR members via the member area of www.isofar.org.

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