Abstract
The current pathotype scheme for Globodera rostochiensis and G. pallida differentiates some pathotypes on the basis of qualitative differences in relation to major resistance genes and others on the basis of quantitative differences in reproduction of populations on differential hosts with polygenic resistance. The former group can be differentiated genotypically whilst the latter are differentiated phenotypically and probably consist of populations which are heterogeneous for virulence genes. This paper is concerned with this latter group. The potato cyst nematode was introduced into Europe from South America and knowledge of the characteristics of each separate introduction might form the basis for classifying the various populations and virulence groups. Several mainly British G. pallida Pa2/3 populations were studied to see which, if any, natural groups could be identified by the use of isozyme and RFLP analysis. Both methods indicated similar results namely that there were no clear and consistent patterns either in terms of virulence or geographic location with one exception from Scotland. This population shows a marked difference in its virulence on the partially resistant cv. Morag.
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