Alternaria japonica
black spot of radish
Alternaria raphani, Alternaria brassicae var. macrospora, Alternaria matthiolae
Africa: Egypt, Kenya, South Africa, Tunisia, Zimbabwe; Asia: Bangladesh, Bhutan, China, India, Iran, Iraq, Israel, Japan, Myanmar, Pakistan, Saudia Arabia, South Korea, Taiwan, Thailand; Europe: Austria, Czechia, Denmark, Finland, France, Germany, Greece, Hungary, Italy, Netherlands, Russia, United Kingdom; North America: Canada, Cuba, United States; Oceania: Australia, French Polynesia, New Caldonia, New Zealand, Papua New Guinea; South America: Brazil.
AZ, CA, FL, MA, MI, MN, MS, NJ, OH, PA, SC.
2024-08-20
fungus
Korea
Main: brassicas, radish. Other: tomato
ALTERP
Alternaria japonica causes black spot disease in cruciferous plants and is well established worldwide. It has a broad host range within the Brassicaceae family and can be difficult to eradicate as it can survive in the soil for years.
5 Known Hosts
Brassica napus
rapeseed
Yes
ALTERP-2, ALTERP-5, ALTERP-6, CABICPC, ALTERP-8, ALTERP-9
Seed as a pathway is established and accepted.
Yes
Blotter incubation, culture plating
CABI describes the blotter and incubation methods for this pathogen. Commercial testing is available, although these methods have not been standardized or validated. One reference indicates a DNA-based test; however, this method has also not been validated.
CABICPC, ISFRPLD
Chemical, Cultural
Plant disease-free seed. Crop rotation can help where the fungus is persistent in soils. Eradicate volunteer hosts. Chemical, Physical, and biological seed treatments have been reported to be effective in controlling seed inoculum.
ALTERP-5, CABICPC
Farr, D.F., and Rossman, A.Y. Fungal Databases, Systematic Mycology and Microbiology Laboratory, ARS, USDA. 2020, http://nt.ars-grin.gov/fungaldatabases/
Saharan GS, Mehta N and Meena PD. 2016. Alternaria Diseases of Crucifers: Biology, Ecology and Disease Management. Springer Science+Business Media Singapore Pte Ltd. is part of Springer Science+Business Media (www.springer.com)
Petrie GA, 1974. Fungi associated with seeds of rape, turnip rape, flax, and safflower in western Canada, 1968-73. Canadian Plant Disease Survey, 54:155-165
Al‐lami, H. F., You, M. P., Mohammed, A. E., & Barbetti, M. J. (2020). Virulence variability across the Alternaria spp. population determines incidence and severity of Alternaria leaf spot on rapeseed. Plant pathology, 69(3), 506-517.
Rop, N. K., Kiprop, E. K., & Ochuodho, J. O. (2009). Alternaria species causing black spot disease of Brassicas in Kenya
Brassica oleracea vars.
broccoli, brussel sprouts, cabbage, cauliflower
Yes
ALTERP-2, ALTERP-5, ALTERP-7, CABICPC, ISFRPLD, ALTERP-9
Seed as a pathway is established and accepted.
Yes
Blotter incubation, culture plating
CABI describes the blotter and incubation methods for this pathogen. Commercial testing is available, although these methods have not been standardized or validated. One reference indicates a DNA-based test; however, this method has also not been validated.
CABICPC, ISFRPLD
Chemical, Cultural
Plant disease-free seed. Crop rotation can help where the fungus is persistent in soils. Eradicate volunteer hosts. Chemical, Physical, and biological seed treatments have been reported to be effective in controlling seed inoculum.
ALTERP-5, CABICPC
Farr, D.F., and Rossman, A.Y. Fungal Databases, Systematic Mycology and Microbiology Laboratory, ARS, USDA. 2020, http://nt.ars-grin.gov/fungaldatabases/
Saharan GS, Mehta N and Meena PD. 2016. Alternaria Diseases of Crucifers: Biology, Ecology and Disease Management. Springer Science+Business Media Singapore Pte Ltd. is part of Springer Science+Business Media (www.springer.com)
Holtzhausen MA and Knox-Davies PS, 1974. Pathogens of cruciferous vegetable crops in commercial seed samples in South Africa. Phytophylactica, 6:289-294
Rop, N. K., Kiprop, E. K., & Ochuodho, J. O. (2009). Alternaria species causing black spot disease of Brassicas in Kenya
Brassica rapa
turnip, chinese cabbage
Yes
ALTERP-2, ALTERP-5, ALTERP-6, CABICPC, ALTERP-9
Seed as a pathway is established and accepted.
Yes
Blotter incubation, culture plating
CABI describes the blotter and incubation methods for this pathogen. Commercial testing is available, although these methods have not been standardized or validated. One reference indicates a DNA-based test; however, this method has also not been validated.
CABICPC, ISFRPLD
Chemical, Cultural
Plant disease-free seed. Crop rotation can help where the fungus is persistent in soils. Eradicate volunteer hosts. Chemical, Physical, and biological seed treatments have been reported to be effective in controlling seed inoculum.
ALTERP-5, CABICPC
Farr, D.F., and Rossman, A.Y. Fungal Databases, Systematic Mycology and Microbiology Laboratory, ARS, USDA. 2020, http://nt.ars-grin.gov/fungaldatabases/
Saharan GS, Mehta N and Meena PD. 2016. Alternaria Diseases of Crucifers: Biology, Ecology and Disease Management. Springer Science+Business Media Singapore Pte Ltd. is part of Springer Science+Business Media (www.springer.com)
Petrie GA, 1974. Fungi associated with seeds of rape, turnip rape, flax, and safflower in western Canada, 1968-73. Canadian Plant Disease Survey, 54:155-165
Rop, N. K., Kiprop, E. K., & Ochuodho, J. O. (2009). Alternaria species causing black spot disease of Brassicas in Kenya
Raphanus sativus
radish
Yes
ALTERP-2, ALTERP-5, ALTERP-7, CABICPC, ALTERP-9
Seed as a pathway is established and accepted.
Yes
Blotter incubation, culture plating
CABI describes the blotter and incubation methods for this pathogen. Commercial testing is available, although these methods have not been standardized or validated. One reference indicates a DNA-based test; however, this method has also not been validated.
CABICPC, ISFRPLD
chemical, Cultural
Plant disease-free seed. Crop rotation can help where the fungus is persistent in soils. Eradicate volunteer hosts. Chemical, Physical, and biological seed treatments have been reported to be effective in controlling seed inoculum.
ALTERP-5, CABICPC
Farr, D.F., and Rossman, A.Y. Fungal Databases, Systematic Mycology and Microbiology Laboratory, ARS, USDA. 2020, http://nt.ars-grin.gov/fungaldatabases/
Saharan GS, Mehta N and Meena PD. 2016. Alternaria Diseases of Crucifers: Biology, Ecology and Disease Management. Springer Science+Business Media Singapore Pte Ltd. is part of Springer Science+Business Media (www.springer.com)
Holtzhausen MA and Knox-Davies PS, 1974. Pathogens of cruciferous vegetable crops in commercial seed samples in South Africa. Phytophylactica, 6:289-294
Rop, N. K., Kiprop, E. K., & Ochuodho, J. O. (2009). Alternaria species causing black spot disease of Brassicas in Kenya
Solanum lycopersicum
tomato
No
ALTERP-4, ISFRPLD
Not a host. Though CABI (2020) lists tomato as a possible host and cites Khulbe and Sati (1987) as a reference, but no data was presented and the source of the seed was not given. No other references were found indicating tomato is a natural host for this pathogen.
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