Home • Cochliobolus heterostrophus PR9b v2.0
Please note that this organism is for archival use only. Please see the current Cochliobolus heterostrophus PR9b v4.0 site for the latest data and information.
Photo of Cochliobolus heterostrophus PR9b v2.0
Southern corn leaf blight and stalk rot (Bipolaris maydis, also known as Cochliobolus heterostrophus). Image Credit: Department of Plant Pathology , North Carolina State University, via Bugwood.org used under a Creative Commons Attribution-Noncommercial 3.0 License.

Cochliobolus heterostrophus strain PR9B is a MAT1-1 field isolate, collected by L. Hsu in Poza Rica, Mexico, around the time of the Southern Corn Leaf Blight (SCLB) epidemic. Like the reference strain C5, it is a race O, non T-toxin producing strain. Before 1970, C. heterostrophus was known as an endemic pathogen of minor economic importance, first described in 1925 by Dreschler; after the appearance of race T, this race was named “race O”. Note both fungal races are pathogenic to corn, but race T is highly and specifically virulent on Texas male sterile cytoplasm (Tcms) corn.