Final diagnosis


Spongospora subterranea (Powdery scab)

Lésions de gale poudreuse (<i><b>Spongospora subterranea</i></b>) sur tubercules : stade avancé (ouvertes et libérant une poudre brune de spores)
Mature brownish lesions of powdery scab (<b><i>Spongospora subterranea</i></b>)
Raised “teat-shaped” tubers observed in the case of severe attack (cultivar specific). <b><i>Spongospora subterranea</i></b> (powdery scab)
Raised “teat-shaped” tubers observed in the case of severe attack (cultivar specific). <b><i>Spongospora subterranea</i></b> (powdery scab)
Root galls or cankers. <b><i>Spongospora subterranea</i></b> (powdery scab)