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Potato wart or potato canker – Synchytrium endobioticum

Synchytrium endobioticum - Infected potato plant - Agriculture & Agri-Food Canada, Research Branch

Potato wart disease is caused by a soil-borne fungus, Synchytrium endobioticum, that attacks the growing points on the potato plant, such as eyes, buds and stolon tips. The fungus can remain dormant in the soil for several years or more as resting spores.

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