Summary

Worldwide distribution. On carrot, and other members of the carrot family (although some taxonomists dispute this, and believe the fungus only infects carrot). Importance not well documented.
The fungus causes: (i) damping-off; (ii) stalk infection leading to crown and root infection; (iii) black sunken storage rots.
Spread occurs on seed, and it is likely that spores are spread in rain splash.
Cultural control: healthy seed or treat with hot water (or 0.1% sodium hypochlorite) at 50°C for 30 mins.; 3-4 –year crop rotation without crops in the carrot family; collect and burn trash after harvest.
Chemical control: none recommended.

Common Name

Carrot black rot

Scientific Name

Alternaria radicina; also known as Stemphylium radicinum.

AUTHOR Grahame Jackson
Photo 1 Kohler F, Pellegrin F, Jackson G, McKenzie E (1997) Diseases of cultivated crops in Pacific Island countries. South Pacific Commission. Pirie Printers Pty Limited, Canberra, Australia). Information from Diseases of vegetable crops in Australia (2010). Editors, Denis Persley, Tony Cooke, Susan House. CSIRO Publishing.

Produced with support from the Australian Centre for International Agricultural Research under project PC/2010/090: Strengthening integrated crop management research in the Pacific Islands in support of sustainable intensification of high-value crop production, implemented by the University of Queensland and the Secretariat of the Pacific Community.

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