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Potato crop exhibiting symptoms of potato cyst nematode attack
Agriculture and Food Science in Northern Ireland

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On heavily infested plants mature females and cysts are clearly visible on roots
Photo by Agriculture and Agri-Food Canada, Research Branch

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Mature females of Globodera pallida (white potato cyst nematode) attached to plant roots. Females are always white to slightly cream color.
Photo by Central Science Laboratory, Sand Hutton, York (GB)

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Mature females and cysts of Globodera rostochiensis (golden potato cyst nematode). Females progress from white to a golden yellow phase before darkening into a cyst.
INRA Antibes

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Potato cyst nematode cysts visible at the surface of potato tubers
SHELL

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Portion of a potato tuber strongly infested with G. pallida. Notice the white colored females (H) and the brown colored cysts (Q).
Photo by Nicola Greco and Renato Crozzoli