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Morphological Variation in Some Populations of Potato Cyst-Nematodes From Europe and South America

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For more content, see Nematology.

A hundred and thirty one populations of potato cyst-nematodes from South America and sixteen populations from elsewhere were examined and several methods of assessing their variability are described, including hierarchical analyses of variance and canonical variate analyses. A simple method of determining the minimum number of observations of a given character required to differentiate between given populations is also described. Some effects of changes of environment on nematode morphology are reported and standard procedures for comparative morphological studies are recommended. Populations collected in South America north of 15.6° S were Globodera pallida except for one or two populations which seemed to be mixtures of G. pallida and G. rostocbiensis and two populations of G. rostocbiensis in Venezuela which may have been introduced from Europe.

Affiliations: 1: Rothamsted Experimental Station, Harpenden, Herts., England


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