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Changes in the Relative Proportions of the Two Species of Potato Cyst Nematodes in Microplots in Which Different Potato Clones Were Grown for Seven Years

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Ten microplots with a capacity 176 litres, containing loam soil, were infested with equal numbers of Globodera pallida and G. rostochiensis to give an overall density of approximately 30 eggs per g of soil. Ten potato clones were grown annually, one clone per microplot, for a period of seven years and soil samples were taken each year after harvest. One cultivar with the H1 gene (Maris Piper) was tested together with nine non-resistant cultivars/clones. These nine consisted of two first early, two second early and three maincrop cultivars, and two accessions from South America (one from an area where G. rostochiensis seems to predominate and one from an area where only G. pallida occurs). Nematode population densities in the microplots were estimated each year and, from a morphological examination of a sub-sample of second-stage juveniles from each plot, the proportions of the two nematode species were also estimated. At the end of the experiment, the proportions of the two species were also estimated in a bioassay and by isoelectric focusing (IEF) of proteins extracted from sub-samples of cysts. Globodera rostochiensis was rapidly eliminated from the plot which grew Maris Piper; Craig's Alliance and the two accessions from South America favoured G. pallida development, but there was no clear trend in proportions of the species in the plots growing the other cultivars. Agreement between the estimation of proportions of the species by bioassay and IEF was generally good.

Affiliations: 1: AFRC-IACR, Rothamsted Experimental Station, Harpenden, Herts. UK


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