Potato crop exhibiting symptoms of potato cyst nematode attack
On heavily infested plants mature females and cysts are clearly visible on roots
Mature females of Globodera pallida (white potato cyst nematode) attached to plant roots. Females are always white to slightly cream color.
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.
Potato cyst nematode cysts visible at the surface of potato tubers
Portion of a potato tuber strongly infested with G. pallida. Notice the white colored females (H) and the brown colored cysts (Q).