Situation with Colorado beetle Leptinotarsa decemlineata Say resistance to insecticides in the North-Western region of Russia

The results of long-term monitoring of insecticide resistance in the Colorado potato beetle in the North-Western region of the Russian Federation are presented. The formation of group resistance to pyrethroids and neonicotinoids in the Leningrad, Pskov, Novgorod, Vologda and Kaliningrad pest populations was established. The formation of cross-resistance to Spinosad in populations highly resistant to pyrethroids was revealed. In a number of populations, the development of resistance to organophosphorous drugs was noted. Against this background, the formation of multiple resistance to the control means in the populations of Colorado potato beetle was found. The reasons for the formation of insecticide-resistant populations of phytophage are the intensive use of insecticides of different chemical classes in its control, as well as the introduction of resistant pest genotypes from neighboring regions. To identify the development of resistance in the Colorado potato beetle to insecticides, it is necessary to monitor this process, which is based on the use of phenotypic method for assessing changes in the structure of populations under the influence of toxic effects, and toxicological method based on testing larvae of 2nd stage with diagnostic concentrations of drugs.