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Potato is the fourth important cultivated crop in Ukraine; the potato cyst nematode Globodera rostochiensis, Ro1 consists one of the most serious threats to its industry. A total of 3769 cultivars and hybrids were assessed for resistance to G. rostochiensis from 1992 to 2002. On the base of the two-stages assay, resistance was identified at 419 and partial resistance at 90 genotypes, which had inherited resistance from 39 resistant cultivars and 23 hybrids. Resistance of the 74 genotypes was confirmed in both greenhouse and field plots; their effectiveness in reduction of population densities of G. rostochiensis varied from 51 to 96% in one season. The tolerance of 5 Ukrainian potato resistant cultivars was investigated in the field plots and all of them were classified as intolerant.

Resistance and tolerance to potato cyst nematodes among Ukrainian potato cultivars and breeding materials