Servicio de Información Comunitario sobre Investigación y Desarrollo - CORDIS

The effect of production location on development of Alternaria disease of carrots in the field and during storage has been established

Organic carrots were produced from the same seed batches containing Alternaria contamination in 3 locations in Europe (DK, NL, and F) in two subsequent seasons. Sampling was performed 2 months after sowing, at the end of the growing season, after 1 month storage, and after 3 months storage. The place of production had a large influence on the contamination of the carrot roots produced. Production in NL resulted in high contamination levels of A. radicina, whereas production in F resulted in high levels of A. alternata contamination. Production in DK gave intermediate results. A correlation between the initial seed contamination and edible root contamination has been established, suggesting that disease-free starting material is important. With regard to the analysis for mycotoxins, no Alternaria alternata mycotoxins were found in 254 organic carrot samples collected at harvest and during storage in the 2 subsequent growing seasons. With respect to Alternaria radicina phytotoxins, only 3 out of 254 samples were contaminated with epi-radicinol, and one also contained radicinin. Occasionally, carrot samples showing black rot symptoms caused by Alternaria radicina were found contaminated with epi-radicinol and, less frequently, radicinin and radicinol. These compounds were tested on human cell lines, Artemia salina brine shrimps, and carrot seedlings and showed a phytotoxic activity other than harmful to humans and animals.

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