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We detected significant virulence differences among five tested (PsI-Puujärvi,PsI-Pyhäjärvi, PsI-Kukkia, PsI-Saimaa I and PsI-Saimaa II) PsI-genotype crayfish plague(Aphanomyces astaci) isolates against lake Mikitänjärvi noble crayfishpopulation. The crayfish were inoculated with a dose of 300 m·L-1A.astaci spores in ambient water under experimental conditions. Mortalitiesstarted from four to seven days after inoculation, depending on the PsI-genotype isolate.In all the experimentally infected groups it took no more than three days for all thecrayfish to die after the first mortality. The PsI-Puujärvi isolate proved to be the mostvirulent strain, while PsI-Kukkia was the least virulent. The average day of death forthese experimental groups was fifth and ninth day, respectively. We did not discovercorrelation between the average day of death and gender or level of additionalPsorospermium haeckeli infestation. Our results show that there are,from the practical point of view, minor virulence differences among PsI-genotypeA. astaci isolates, and that all the tested five isolates are highlyvirulent. The present results emphasize the necessity to prevent all further spread ofhighly virulent strains of A. astaci to aid and shelter successfulconservations attempts of the native European crayfishes

Aphanomyces astaciPsI-genotype isolates from different Finnish signal crayfish stocks show variation in their virulence but still kill fast