The experiment was performed in the year 2016. We were collecting the adults of pollen beetle in different locations in Slovenia. In the laboratory we were investigating the resistance of a pollen beetle with four different pyrethroids: alfa-cypermethrin, deltamethrin, lambda-cyhalothrin in beta-cyfluthrin in six different concentrations (25 %, 50 %, 100 %, 200 %, 400 % and 800 %). The purpose of the study was to determine the resistance of pollen beetle to pyrethroids. We expressed results as percentage affected. Each treatment had three replicates. We found out that pyrethroids have different effects on the different populations of pollen beetles. At the first location the greatest effect was with 800 % deltamethrin and the lowest effect was with 25 % beta-cyfluthrin. On the second location 200 % lambda-cyhalothrin has proved itself with good results, but also the biggest resistance was detected at treating with 25 % lambda-cyhalothrin. At the last location the most effective was 100 % deltamethrin. The less affected were pollen beetles treated with 50 % alfa-cypermethrin.
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