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Pot and Field Assessment of Partial Resistance of Potato Clones To Different Populations and Densities of Globodera Pallida

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The effect of initial population density on the rates of multiplication of Globodera pallida on a non-resistant potato cultivar and on three genotypes with resistance derived from Solanum vernei was compared in a field trial and a pot test. On all the cultivars and genotypes the multiplication rate of G. pallida decreased as the initial population density increased. The results of the field and pot experiments were similar except that they differed in magnitude; the mean rate of multiplication in the pots being greater (c. x 2.5) than in the field. Both field and pot experiments ranked the four hosts in the same relative order of resistance and joint regression analysis showed that for each host the two sets of results formed a continuous series; as the overall mean rate of multiplication on the four hosts increased the mean multiplication rate on each of the individual hosts increased linearly whether the results were from the pot or the field. Therefore, it is suggested that pot tests can be used to assess clones with partial resistance provided they include partially resistant standard clones whose performance in the field has been well established and to which the results can be related. The different initial population densities of G. pallida used in these experiments had been produced over 3 years by cropping plots with hosts having different degrees of resistance. The virulences of the resulting populations were examined in a further pot test which indicated that there were differences between them. However, there was no evidence for markedly specific selection of virulence. The differences detected were largely non-specific with the populations reared on S. vernei hybrids producing more females on all clones included in the test.

Affiliations: 1: Scottish Crop Research Institute, Invergowrie, Dundee DD2 5Da, Scotland


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