Alternaria radicina
black rot of carrot
Macrosporium daucinum, Pseudostemphylium radicinum, Stemphylium radicinum, Thyrospora radicina
Worldwide
AK. CA, CT, ID, MA, MI, MN, NY, OH, OR, PA, WA, WI
2025-12-01
fungus
Mexico
Main: carrot
ALTERA
Alternaria radicina is a fungal pathogen that primarily affects carrots, causing seedling blight, damping-off, leaf spots, and black rot of roots in the field and storage. It is primarily transmitted by contaminated soil, infected debris, and seed in carrots. Warm, humid conditions favor disease spread.
Crops
Coriandrum sativum
coriander
Uncertain
CABI CPC, ALTERA-11, ALTERA-12, ALTERA-13, ALTERA-14, ALTERA-14
Alternaria radicina was confirmed as the cause of coriander leaf blight through artificial inoculation of 8-week-old plants in a greenhouse. Although the disease was first observed on naturally infected plants in the field, evidence for seed transmission came from experimental testing and has not been confirmed under natural conditions.
PCR
PCR testing was used in experimental studies.
2025-12-01 08:38:41
Crop Protection Compendium. Wallingford, UK: CAB International. www.cabi.org/cpc.
El-Gamal, S. M., Rashad, E. M., Saber, W. I., Al-Askar, A. A., Helmy, Y. A., Ghoneem, K. M., & Ibrahim, A. A. (2025). Thyme and cumin eones: a safe and effective strategy for controlling Alternaria radicina in coriander, enhancing growth, and reducing cytotoxicity. Physiology and Molecular Biology of Plants, 1-22.
Gadotti, G. I., da Silva, R. N. O., de Farias, C. R. J., da Silva, J. G., & Padão, H. L. (2021). Fungal and seed treatment interference in the viability of coriander seeds. Horticultura Brasileira, 39, 376-382.
Ghoneem, K. M., Rashad, E. M., Al-Askar, A. A., Helmy, Y. A., El-Gamal, S. M., Ibrahim, S. D., & Saber, W. I. (2025). Alternaria radicina; unveiling the cause, spread, and molecular basis of a novel coriander leaf blight disease in Egypt. Heliyon, 11(1).
Mackinaite, Rimute. (2012). Potential pathogens of common caraway (Carum carvi L.) seeds and search for measures suppressing their spread. Zemdirbyste. 99. 179-188.
Daucus carota
carrot
Yes
ALTERA-2, ALTERA-3, CABI CPC, ALTERA-7, ALTERA-8, ALTERA-9, ALTERA-10
Seed transmission of this pathogen in carrot is well documented and accepted
Yes
Blotter assay, Agar plating, PCR
METHOD: Rb 3.1 ISTA Method 7-002a: ver 1.5 (2024)
ISTA blotter method is the NSHS Standard Method
NSHS USDA, ISTA
Cultural, Chemical
Remove infested debris. Four-year crop rotation. Hot water, Hot sodium hypochlorite, Thiram soaks
ALTERA-2, CABI CPC
2025-12-01 08:37:14
Pryor, BM, Davis, RM, Gilbertson RL, 1994 Detection and eradication of Alternaria radicina on carrot seed. Plant Disease 78:452-456
Pryor BM, Gilbertson, RL. 2001 A PCR-based assay for detection of Alternaria radicina on carrot seed. Plant Disease 85; 18-23
Crop Protection Compendium. Wallingford, UK: CAB International. www.cabi.org/cpc.
Liu, W., Xu, S., Ou, C., Liu, X., Zhuang, F., & Deng, X. W. (2024). T2T genomes of carrot and Alternaria dauci and their utility for understanding host–pathogen interactions during carrot leaf blight disease. The Plant Journal, 120(4), 1643-1661.
Coles, R. B. and Wicks, T. J. 2003. The incidence of Alternaria radicina on carrot seeds, seedlings and roots in South Australia. Australasian Plant Pathology 32(1): 99-104.
Nega, E., Ulrich, R., Werner, S. and Jahn, M. (2003). Hot water treatment of vegetable seed an alternative seed treatment method to control seed borne pathogens in organic farming. Journal of Plant Diseases and Protection 110(3): 220-234.
Maude, R.B. (1966). Studies on the etiology of black rot, Stemphylium radicinum and leaf blight Alternaria dauci on carrot crops and on fungicide control of their seed-borne infection phases. Annals of Applied Biology 63: 287-294.
United Stated Department of Agriculture, Animal and Plant Health Protection Service National Seed Health System (USDA-APHIS NSHS) www.seedhealth.org
International Rules for Seed Testing. International Seed Testing Association; www.seedtest.org
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