Abstract
The potato cyst nematode, Heterodera rostochiensis Wollenweber, has been identified for the first time in Japan from potato fields at Makkari, Hokkaido during July 1972. Population levels of the nematode in these fields appeared comparatively high. The nematode-infesting potato plants showed poor growth of the above-ground parts. General morphology of the larvae, adults, and cysts of this nematode is identical with one reported previously by other research workers.
