Abstract
SUMMARY: In a study of heavily infested soils in England from 1972 to 1975, potato cyst nematodes (Globodera rostochiensis (Woll.) Mulvey & Stone and G. pallida (Stone) Mulvey & Stone) were often as numerous in soil 20–40 cm deep as in soil 0–20 cm deep. Below 40 cm the nematodes were uncommon. Beet cyst nematode (Heterodera schachtii Schm.) was also as numerous or more numerous 20–40 or 40–60 cm deep as 0–20 cm deep. Pea cyst nematode (H. goettingiana Liebs.) was uncommon below a depth of about 20 cm.