Abstract
Aim. The Colorado potato beetle population is characterized by a high degree of polymorphism. This provides a high level of adaptability to the most diverse distribution conditions. The aim is to the study of the variability of the pattern of Leptinotarsa decemlineata pronotum in June 2021 and June 2022. Methods. The analysis of the phenotypic variability of L. decemlineata population of Kamianka-Buzka city based on studying the presence or absence of certain phens, their number and placement according to Tauer method. Results. 22 variations of phens belonging to A, B, C, D, E, G, K, L, M, P groups were found. The dominant were phens of A, B, C, D, E, F groups. The most variable were the phens of A and E groups. The phenotypic structure of the colorado beetle population was determined according to Kohmaniuk’s classification. It was found that the dominant morphs in 2021 and 2022 were U (42 % and 27 %), UP (13 % and 18 %) and V (23 % and 21 %), respectively. Conclusions. The analysis of the frequency of phenoforms according to the Fasulati method showed that in the population of 2021 and 2022, phenoforms 3, 6 and 9 were dominant. They form the basis of the population and ensure the resistance of the population to the insecticides. The study of the intrapopulation diversity indicates an unbalanced population structure of L. decemlineata.
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