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Cochliobolus carbonum (maize leaf spot )
Cochliobolus carbonum
maize leaf spot
Bipolaris zeicola, Drechslera carbonum, Drechslera zeicola, Helminthosporium carbonum, Helminthosporium zeicola
Worldwide
Eastern and Midwestern United States
2022-11-11 18:53:10
fungus
Korea
This pathogen infects corn, primarily, though there are a few reports on sorghum, rice and other grasses
COCHCA
Referred to as Bipolaris zeicola in the ISF RPLD
1 Known Hosts
Zea mays
corn
No
COCHCA-1,COCHCA-2,COCHCA-4,ISF RPLD
Pathway not proven. No seed transmission of the pathogen has been recorded. Cochliobolus carbonum is commonly found on seed and turns seed black. Levels of infection have not been reported. Ear rots are only occasionally reported.
Yes
Freezing blotter method
Freezing blotter is the standard method of the NSHS
COCHCA-3,ISF RPLD
Fungicide seed treatements
Resistance to race 1 is known.
COCHCA-1,COCHCA-4
COCHCA-1
Cochliobolus carbonum. In: Crop Protection Compendium. Wallingford, UK: CAB International. www.cabi.org/cpc.
COCHCA-2
Koehler B, 1959. Corn ear rots in Illinois. Ill. Agric. Exp. Stn. Bull 638
COCHCA-4
McGee, DC. 1988. Maize Diseases: A reference Source for Seed Technologists. APS Press, St. Paul, MN USA. 150 pp.
ISF RPLD
International Seed Federation Regulated Pest List Database. pestlist.worldseed.org Nyon Switzerland
COCHCA-3
Seed Health Testing Method for Cochliobolus carbonum Mz 2.1 National Seed Health System, 2019. www.seedhealth.org
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