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For more information about the cookies we use, you can contact INRAE's Data Protection Officer by email at cil-dpo@inrae.fr or by post at :

INRAE

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

Last update: May 2021

Other discolorations

Discolorations due to physiological disorders

Browning after skinning		Visual diagnosis The skin of the tuber is partially or completely peeled off, exposing the underlying tuber flesh to the air As a consequence, due to enzymatic reaction, rust-brown areas are formed on the tuber surface Cause Mechanical damage on immature tubers with unset skin


Greening	Pinking	Visual diagnosis Partial or complete greening or pink discoloration of the tuber skin Causes Excessive exposure to light:either in the soil (open ridge) or following unadequate storage conditions Green or pink discoloration depends on the variety

Discolorations due to biotic factors (under construction, to be completed)
Viruses
PMTV (Potato Mop Top virus)	TRV (Tobacco Rattle Virus)	Visual diagnosis Brown irregular lines and blotches External symptoms linked to brown arcs and necrotic areas internally Spraing due to PMTV or TRV are generally not typical enough to allow a precise diagnosis Confirmatory diagnosis Confirmatory diagnosis relies on serogical or DNA diagnostic tests
PVY^NTN(Potato Tuber Necrotic Ringspot Disease = PTNRD)	PVY^NTN(PTNRD)	Visual diagnosis Brown blisters in the form of arcs, rings or lines The necotic tissues become later depressed and may even crack The symptoms remain limited to the periderm Confirmatory diagnosis Confirmatory diagnosis relies on serogical or DNA diagnostic tests

Fungus Violet root rot (Rizoctoniacrocorum)
		Visual diagnosis Tubers are often covered with reddish-purple mycelial network. Under the mycelial mats, tubers may have dark gray spots covered with purplish black sclerotia Cause Rizoctoniacrocorum
Oomycetes
Pink rot (Phytophthora erythroseptica)	Pink rot (Phytophthora erythroseptica)	Visual diagnosis Dark brown or black irregular on the tuber surface Symptoms may show specifically around lenticels External symptoms linked to lesions internally Infected tubers may leak liquid from lenticels and feel spongy Similar symptoms may be caused by Pythium spp. and Phytophthora infestans Confirmatory diagnosis Isolation onto agar from the leading edge of the internal lesion Microscopoc observation of the spores In the case of pink rot, the internal tissue turns pink within 30 min after exposure to air
Leak rot (Pythium spp.)	Late blight (Phytophthora infestans)