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Shift of Pathotypes of Heterodera Rostochiensis Under Susceptible Potato Cultivars

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An equal mixture of Dutch pathotypes A and D of Heterodera rostochiensis was bred on three different Solanum tuberosum cultivars for three successive years. At the end of each year, shift in pathotype ratio was observed by single-cyst tests on ex-andigena potatoes. Larval measurements taken from progenies of single cysts on ex-andigena potatoes have proved that the pathotypes and hybrids occur within one and the same cyst, which gives proof of hybridization and competition between the species H. rostochiensis (pathotype A) and H. pallida (pathotype D). It is clear that cropping of susceptible potato cultivars does not prevent pathotype shift.

Affiliations: 1: Plantenziektenkundige Dienst, Wageningen, Netherlands


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