Pseudomonas fuscovaginae was isolated from brown rot lesions on leaf sheaths and husks of maize at the silking stage and on flag leaf sheaths of sorghum at the booting stage in smallholders’ fields between 1,450 and 2,100 meters above sea level in Burundi. In comparative biochemical, serological, and pathogenicity tests, the strains from maize and sorghum were similar to those previously isolated from rice.