The question about the reproducibility of test data from contact insecticide tests with Lyctus brunneus has been asked within the IRG. Three laboratories decided to interchange their insects and to carry out a comparative test according to the EMPA screening method. In order to get enough animals for the test the three strains had to be grown during three generations in each of the laboratories. Due to reason of time the consecutive tests could only be carried out at the EMPA. The results show that the three strains do not show any different resistance against lindane and permethrin and that they can therefore be applied as standard test insects in the three different test labs.

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