Abstract: The invention relates to the field of protecting plants against pests, and more particularly to a method of protecting plants against pests, which can be used for industrial and scientific purposes, in agriculture, horticulture and forestry. The method of protecting plants against pests according to the present invention comprises applying a biologically active preparation pre-activated in an aqueous medium to a plant, the preparation comprising microcontainers and a biological insecticide, wherein the microcontainers are made from a polymeric material in the form of a hollow receptacle with at least one opening, via which the biological insecticide is placed inside the microcontainers. The invention also provides a microcontainer and a preparation for realisation of the stated method. Furthermore, the invention provides methods for producing a microcontainer and the aforementioned preparation.