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Identification of measures for prevention of black spots in organically produced stored carrots

Koehl, Juergen; Kastelein, Pieter; Elderson, Janneke and Blok, Wim J. (2005) Identification of measures for prevention of black spots in organically produced stored carrots. Paper at: Researching Sustainable Systems - International Scientific Conference on Organic Agriculture, Adelaide, Australia, September 21-23, 2005. [Unpublished]

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Summary

In the Netherlands winter carrot for the fresh market is a cash crop for many organic growers of field vegetables. In the last few years blackish spots have been observed during storage of carrot roots. An inventory was carried out in 2001/2002 and 2002/2003 including in total 42 carrot lots from 22 growers. Statistical analysis was performed by multiple regression analysis to identify factors and variables that best explained the occurrence of black spots on stored carrots.
Rhexocercosporidium carotae was the dominating pathogen in black spots of carrots harvested in 2001. From carrots harvested in 2002, Alternaria radicina was isolated most frequently, followed by A. dauci and R. carotae. Multiple regression analysis indicated that the occurrence of R. carotae was associated with wild umbelliferous plants or carrot production during the previous year in the neighbourhood of the investigated carrot fields. A high occurrence of the symptoms of black spots was associated with increasing damage caused during harvest or with higher temperatures during harvest.


EPrint Type:Conference paper, poster, etc.
Type of presentation:Paper
Keywords:Organic farming, carrots, black spots, Alternaria radicina, Rhexocercosporidium carotae
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:4305
Deposited On:15 Nov 2005
Last Modified:12 Apr 2010 07:30
Document Language:English
Status:Unpublished
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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