The development of rearing technologies for the agents of biological control of crop pests is an important and urgent task, the solution of which lies at the intersection of the engineering and the biological sciences. One of the promising agents for the biological control of aphids is lady beetle Propylea quatuordecimpunctata. In this study, the feed consumption rate of Propylea quatuordecimpunctata was investigated during the development of its rearing technology. Tests were carried out for larval and adult stages of the entomophage. Wheat aphid (Schizaphis graminum) at various stages of developmental was used to feed lady beetle. To determine the feed consumption by the beetle larvae the Florinsky tubes were used for the dynamics. The newly hatched larvae were placed in tubes one by one and covered with cotton gauze swabs. The wheat aphids were also placed in these containers. Every day, Propylea was moved to other containers, and the number of aphids was counted. There was determined the impact of the initial number of aphids upon the number of phytophages, destroyed by propylaea imago. The insects were kept together in cylindrical plexiglass containers 90 mm high and 75 mm in diameter. The bottom and the top of the containers were covered with a sieve cloth. The tests were repeated five times. The tests resulted in a correlation between the phytophage density and the number of pests, destroyed by the lady beetle. It was found that the density increasing led an increase of the destroyed aphids. The lowest indicator (5 individuals) was observed in the variant where the number of he applied pests was minimal (also 5 individuals). The highest indicator (34 individuals) was in the variant with the maximum initial number of aphids, which was 120.