Powdery Scab of Potatoes
Spongospora subterranea f. sp. subterranea (referred to as S. subterranea), the causal agent of powdery scab and root gall formation in potato, is a soil- and tuber-borne funguslike pathogen. S. subterranea first was reported in the U.S. in 1913. During this same year, the disease was found established in potato-growing states such as Maine, Florida, Minnesota and Oregon. To date, the pathogen can be found causing disease throughout the U.S., as well as several other potato-growing regions around the world.
