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Cochliobolus heterostrophus race T (southern leaf spot )
Cochliobolus heterostrophus race T
southern leaf spot
Bipolar maydays race T, Cochliobolus heterostrophus race T
Worldwide
Widespread
2021-04-28
fungus
Thailand
Corn with Texas male sterile cytoplasms are sucuseptible to race T.
COCHHE
Thailand lists this pathogen as Bipolaris maydis race T. Primarily a pathogen in tropical or semi-tropical climates.
1 Known Hosts
Zea mays
corn
Yes
COCHHE-1, COCHHE-2, COCHHE-3, COCHHE-4
Only Texas male sterile cytoplasms are susceptible to this pathogen. Normal cytoplasmic corns are not susceptible. Seed is known to be a pathway.
Yes
Freezing blotter, Agar plating
Freezing blotter is the standard test of the NSHS.
Freezing blotter is the NSHS standard test
COCHHE-1, NSHSUSDA
Fungicide seed treatments (maneb, captan, carboxin and thiram, propiconazole)
COCHHE-5, COCHHE-6
COCHHE-1
McGee, DC. 1988. Maize Diseases: A reference Source for Seed Technologists. APS Press, St. Paul, MN USA. 150 pp.
COCHHE-2
Cochliobolus heterostrophus race T. In: Crop Protection Compendium. Wallingford, UK: CAB International. www.cabi.org/cpc.
COCHHE-3
Boothroyd CW. 1971. Transmission of Helminthosporium maydis race T by infected corn seed. Phytopathology, 61:747-748.
COCHHE-4
Kommedahl T and Lang DS, 1971. Seedling wilt of corn from kernels naturally infected with Helminthosporium maydis in Minnesota. Plant Disease Reporter, 55:371-373.
NSHSUSDA
COCHHE-5
Kommedahl T and Lang DS, 1973. Effect of temperature and fungicides on survival of corn grown from kernels infected with Helminthosporium maydis. Phytopathology, 63:138-140
COCHHE-6
White DG and Ellett CW, 1971. Helminthosporium maydis seedling blight of popcorn. Plant Disease Reporter, 55:382-384.
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