Wheat blast - Magnaporthe oryzae Triticum pathotype
Effective: 04/22/2020
Taxonomic Position: Magnaporthales : Magnaporthaceae
Pest Type: Fungi
This pest is a member of the following surveys: Small Grains
These Approved Methods are appropriate for: 2023, 2022, 2021
Pest Information
Hosts Identified in the CAPS Host Matrix: Wheat
Pest is vectored by

Approved Method(s)

Survey Recommendations

The following are recommendations for executing the survey using the approved methods for pest surveillance. The recommendations are developed through literature review and consultation with subject matter experts.
Signs and Symptoms
Time of Year to Survey
Survey Site Selection
Sample Collection Instruction
Key Diagnostics or Identification

Approved Method(s)

ID/Diagnostic: Molecular

To request a copy of diagnostic protocols, email the S&T Beltsville laboratory at APHIS-PPQCPHSTBeltsvilleSampleDiagnostics@aphis.usda.gov and use the subject line 'Diagnostic protocol request'.

Mistaken Identities
  1. Cardoso, C. A. d. A., E. M. Reis, and E. N. Moreira. 2008. Development of a warning system for wheat blast caused by Pyricularia grisea. Summa Phytopathologica 34(3):216-221.
  2. Kohli, M. M., Y. R. Mehta, E. Guzman, L. De Viedma, and L. E. Cubilla. 2011. Pyricularia blast–a threat to wheat cultivation. Czech Journal of Genetics and Plant Breeding 47(Special Issue):S130-S134.
  3. Wilson, R. A., and N. J. Talbot. 2009. Under pressure: investigating the biology of plant infection by Magnaporthe oryzae. Nature Reviews Microbiology 7:185-195.

If you are unable to find a reference, contact STCAPS@usda.gov. See the CAPS Pest Datasheet for all references.