Účinnost různých koncentrací lambda-cyhalothrinu, alpha-cypermethrinu a tau-fluvalinatu na lýkožrouta smrkového Ips typographus (Linnaeus 1758) v závislosti na pohlaví

The aim of the experiment was to compare the efficacy of the synthetic pyrethroids lambda-cyhalothrin, alpha-cypermethrin and tau-fluvalinate on the spruce bark beetle (Ips typographus L.), as well as to observe the response based on the sex of the spruce bark beetle. The beetles were captured using barrier pheromone traps (Ridex s. r. o.). For laboratory evaluation of sensitivity, the methodology for testing resistance of the pollen beetle Brassicogethes aeneus (Fabricius, 1775) to insecticides was used according to the recommendations of the Insecticide Resistance Action Committee. The sex of each individual was determined by dissection. After 24 hours of exposure to lambda-cyhalothrin, 0% of both males and females survived, with alpha-cypermethrin, 0% of males and 0.16% of females survived, and with tau-fluvalinate, 2.8% of males and 3.87% of females survived. Statistical analysis of the data (using the Kruskal-Wallis test) indicated that tau-fluvalinate is less effective than lambda-cyhalothrin and alpha-cypermethrin, and that the sensitivity of the spruce bark beetle does not depend on its sex. More females (on average 72%) than males (on average 28%) were attracted to the pheromone traps used.