The results of researches on evaluation of the methods of increasing effectiveness of the Trichogramma spp. in the agrocenosis of cabbage are presented. It has been stated, that at low eggs’ quantity of the lepidopterous pests’ the traditional releases of the egg-parasites cann’t be conducted and must by developed ways of the lepidopterous pests’ density regulation (introduction into the cabbage agrocenosis the eggs of the laboratory host-insects of Trichogramma spp. 2-3 weeks before expected appearance of the layings of the pests or introduction in agrocenosis minimum initial colony of the laboratory population of the trichogramma with simultaneous introduction of the eggs of the laboratory hosts of the entomophage. It has been developed the ecologically safe system protection of cabbage against of the lepidopterous pests with maximum usage of the biological means of protection: inhibitors of chitin synthesis (Nomolt, Damilin), microbiopreparations (Lepidocid) and the Trichogramma spp. The system consists of three technologies of successive application of the biological means of protection depending on dominant insect pests in agrocenosis, climatic conditions and producer’s possibilities.