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Pyricularia oryzae (wheat blast, rice blast )
Pyricularia oryzae
wheat blast, rice blast
Magnaportha oryzae, Magnaportha grisea
Brazil, Paraguay, Bolivia
The Triticum pathotype of this pathogen is not known to occur in the US.
2023-08-21
fungus
Mexico
wheat, rice
PYRIGR
The rice strain of this pathogen is worldwide in distribution. Information for this fungus primarily from PYRIGR-1 and PYRIGR-2
2 Known Hosts
Oryza sativa
rice
Yes
PYRIGR-1, PYRIGR-4, PYRIGR-5
Incident of seed infection in laboratory testing can be significant. However, seed transmission tends to be lower. Seed is known to be a pathway for this pathogen.
Yes
Blotter
PCR tests have been described for the wheat pathotype on wheat samples. (PYRIGR-3)
PYRIGR-1
Several chemical seed treatments are described with varying degrees of success.
PYRIGR-1
PYRIGR-1
Magnaportha grisea In: Crop Protection Compendium. Wallingford, UK: CAB International. www.cabi.org/cpc."
PYRIGR-4
Manandhar HK, et.al. 1998. Seedborne infection of rice by Pyricularia oryzae and its transmission to seedlings. Plant Disease, 82:1093-1099
PYRIGR-5
Guerber C and TeBeest DO, 2006. Infection of rice seed grown in Arkansas by Pyricularia grisea and transmission to seedlings in the field. Plant Disease, 90:170-176.
Triticum aestivum
wheat
Yes
PYRIGR-2, PYRIGR-3
Seed is known to be a pathway for this fungus.
Yes
PCR
This test is used by the USDA APHIS.
PYRIGR-3
No chemicals yet registered in the US
Seed treatments are not registered for use in the US. In Bolivia, Benlate® and Carbendazim+Thiram® have given excellent control
PYRIGR-3
PYRIGR-2
Kansas State Univeristy online publication 2014; http://www.k-state.edu/wheatblast
PYRIGR-3
Recovery Plan for Wheat Blast; http://www.ars.usda. gov
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