Insecticides from the pyrethroid group constitute more than 35% of preparations used currently in the forest protection practice. Multi-year applications of insecticide preparations lead to a decrease of entomofauna's sensitivity to insecticides and to arising of insect varieties resistant against chemical preparations. Insects have many protection mechanisms efficiently allowing to counteract insecticides from the pyrethroid group used at present. The oxidation mechanism with participation of oxidases with mixed functions is one of resistance mechanisms.
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