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Powdery scab (Spongospora subterranea) is a fungal blemish disease of potatoes. A cosmetic defect with small lesions occurring in the early stages of the disease, progressing to raised pustules containing a powdery mass.

There are no above ground symptoms but powdery scab can result in tubers being rejected or downgraded. Cultivar resistance and long rotations are the most effective ways to combat infected land. Clean land should be planted with clean seed and this test will enable you to understand if the land you are intending to use is infected.

Powdery scab is a soil-borne disease favoured by cool, moist conditions and heavy soil. A soil bait test can identify presence of Spongospora subterranea in your soil sample.