A selective survey of potato cyst‐nematode pathotypes in Great Britain

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Abstract
One hundred and forty‐four samples of potato cyst‐nematodes, the majority chosen to contain G. pallida, from England, Wales and Scotland were identified to pathotype. Where G. rostochiensis was present it proved to be pathotype Rol, there being no indication of other pathotypes of this species. Of G. pallida, a minority of samples incorporated pathotype Pa 1; many were pathotype Pa3 but distinction between Pa2 and Pa3 was unsatisfactory in many more. It is concluded that recognition of these latter two pathotypes is of little value. The proposed pathotype New Leake could not be recognized.