Field performance of potato cultivars resistant and partially resistant to Globodera pallida1

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Abstract
Results of field trials of cultivars resistant or partially resistant to Globodera pallida are reported. The effects of the varying resistance levels on the nematode populations were examined. The initial population levels had an important effect on the Pf/Pi ratio. The ranking of the cultivars using the field Pf/Pi values consistently agreed with the resistance ranking obtained using the closed canister method of assessment. Many of the partially resistant cultivars effectively limited the level of increase of the final cyst‐nematode population, if not decreasing the levels from their initial values. It is argued that such partial resistance can contribute positively to the control of potato cyst nematodes within the context of a crop rotation.