Abstract
A description of the biology of potato cyst nematodes,Globodera rostochiensis andG. pallida, and symptom development in potato crops is presented. This is followed by an overview of resistance and tolerance research and an explanation of how resistance derived fromSolanum andigena was deployed in integrated control schemes on sandy and sandy peat soils in the north-east of The Netherlands. The frequent use of this resistance source resulted in the predominance of ‘new’ pathotypes ofG. rostochiensis and ofG. pallida. The ability of the cyst nematodes to respond to new types of resistance with new pathotypes makes the search and breeding for resistance a continuing process. The absence of tolerance in exS. vernei (VTn)2 62-33-3 cultivars showed that resistance, if it is to be of use in severely infested fields, must be combined with an appreciable level of tolerance.
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