EN
Insects’ resistance to insecticides is based on genetical mechanisms created during the time of evolution. Selective pressure of insecticides generates a quick increase of resistance in case of numerous insect species. The results of presented research showed that three pest species (Meligethes aeneus, Ceutorhynchus assimilis, Leptinotarsa decemlineata) with similar control history, have showed a different level of susceptibility to esfenvalerate, acetamiprid and chlorpyrifos. To solve the problem of insect resistance to insecticides. the following requirements should be fulfilled: managing chemical plant protection, carrying out constant monitoring of resistance level and working out strategies preventing resistance phenomenon.