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24, chemin de Borde Rouge -Auzeville - CS52627 31326 Castanet Tolosan cedex - France

Last update: May 2021

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Potato tuber blemishes: understanding & diagnosis




Colletotrichum coccodes 

Black dot

Helminthosporium solani

Silver scurf

Phytophthora infestans

Phytophthora erythroseptica,

Late blight

Pink rot

Pythium spp.

Leak rot

Polyscytalum pustulans

Skin spot


Violet root rot

Rhizoctonia solani

Black scurf

Rhizoctonia corky lesions

Dry core

Cracks & Deformations

Synchytrium endobioticum


Spongospora subterranea


Powdery scab


Streptomyces spp.

Common scab

Netted  scab

Russet scab

PVYNTN (Necrotic Potato Virus Y )

PMTV (Potato Mop Top Virus)

TRV (Tobacco Rattle Virus)

PSTVd (Potato Spindle Tuber Viroid)


Spraing, cracks & deformation


cracks & deformation

Globodera spp.

PCN pitting

Meloidogyne spp.

RKN galls

Slugs (Arion spp., Deroceras spp.)

Slug holes

Agriotes spp.

Wireworms holes


Tuber moth

Epitrix spp.

Potato Flea beettle

Due to climatic factors 

Cracks and deformations

Enlarged lenticells

Due to phytotoxicity

Cracks and deformation

CIPC toxicity