Identification of Measures for Prevention of Black Spots in Organically Produced Stored Carrots

J. Köhl¹, P. Kastelein¹, J. Elderson¹ and W. J. Blok ²

Abstract
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.

Source
Köpke et al (Eds) (2005): Researching Sustainable Systems. Proceedings of the First Scientific Conference of the International Society of Organic Agriculture Research (ISOFAR). ISOFAR / IOL / FiBL, Bonn and Frick; ISBN 3-906081-76-1

Author Locations and Affiliations
(1) Plant Research International, P.O. Box 16, 6700 AA Wageningen, The Netherlands,
+31 317 476017, E-Mail: jurgen.kohl@wur.nl, Website: www.pri.wur.nl/uk/
(2) Biological Farming Systems Group, Department of Plant Sciences, Wageningen University, Marijkeweg 22, 6709 PG Wageningen, The Netherlands, +31 317 483124, E-Mail: wim.blok@wur.nl

Paper copy and PDF version may be ordered from FiBL (see FiBL shop at https://www.fibl.org/shop/index.php); 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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Research Extension Courses Consumers -------------------------- Virtual Tours Student & Job Opportunities News Articles Standards -------------------------- Market Information Events Issues Animal Welfare Strategic Plans -------------------------- Links Award-winners Site Map	Identification of Measures for Prevention of Black Spots in Organically Produced Stored Carrots J. Köhl¹, P. Kastelein¹, J. Elderson¹ and W. J. Blok ² Abstract 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. *Source* Köpke et al (Eds) (2005): Researching Sustainable Systems. Proceedings of the First Scientific Conference of the International Society of Organic Agriculture Research (ISOFAR). ISOFAR / IOL / FiBL, Bonn and Frick; ISBN 3-906081-76-1 *Author Locations and Affiliations* (1) Plant Research International, P.O. Box 16, 6700 AA Wageningen, The Netherlands, +31 317 476017, E-Mail: jurgen.kohl@wur.nl, Website: www.pri.wur.nl/uk/ (2) Biological Farming Systems Group, Department of Plant Sciences, Wageningen University, Marijkeweg 22, 6709 PG Wageningen, The Netherlands, +31 317 483124, E-Mail: wim.blok@wur.nl Paper copy and PDF version may be ordered from FiBL (see FiBL shop at https://www.fibl.org/shop/index.php); FiBL order number 1394. A PDF version is available free of charge for ISOFAR members via the member area of www.isofar.org *en français*
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Identification of Measures for Prevention of Black Spots in Organically Produced Stored Carrots

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