Circadian changes of susceptibility to insecticides in colorado potato beetle (Leptinotarsa decemlineata say) observed in laboratory and half-natural conditions

Abstract

In 2004 in the Department of Animal Toxicology UMK (Toruń) and in 2008 in the Department of Ecotoxicology UR (Kolbuszowa) analysis of the circadian changes in the susceptibility of Colorado potato beetle (Leptinotarsa decemlineata Say) was made for two groups of insecticides: pyrethroids (β-cyfluthrin) and oxadiazine (indoxacarb). The research was conducted under both laboratory (UMK) and field conditions (UR) intoxicating animals during the four key times of the day - at sunrise, noon, at sunset and in the middle of the night. Obtained in both types of research results show that Colorado potato beetle is characterized with a statistically important, variable in the daily rhythm, susceptibility to insecticides.