Potato yellow dwarf virus

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malformations on potato tubers caused by Potato yellow dwarf virus (click on image to enlarge it)
Source: Cornell University Archive, Cornell University - IPM Images

Potato yellow dwarf virus (PYDV)

This virus infects plants from the family Solanaceae in North America. The symptoms include severe stunting, yellowing and necrosis. Infected potato plants have few and deformed tubers that show cracks on the surface and internal necrotic spots. These do not germinate. The virus can be transmitted mechanically and by leafhoppers.