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Detection of Pathotypes By Assessing the Virulence of Heterodera Schachtii Populations

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image of Nematologica
For more content, see Nematology.

Soil containing Heterodera schachtii was collected from 146 locations and this assortment of nematode populations was permanently reared on rape. Nematode virulence against Beta genotypes with resistance derived from Beta procumbens as well as against the wild species B. procumbens, B. webbiana and B. patellaris was tested by determining cyst production and multiplication rates. Virulence genes occurred in several populations, but at a low frequency. Virulence was increased by repeated nematode multiplication on a resistant Beta genotype derived from B. procumbens, and multiplication rates attained 51.9% of those on a susceptible cultivar. As the virulence is breaking a major gene resistance these nematode populations are a pathotype of H. schachtii.

Affiliations: 1: Biologische Bundesanstalt für Land- und Forstwirtschaft, Institut für Nematologie und Wirbeltierkunde, Toppheideweg 88, D-4400 Münster, Germany


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