The article discusses the issue of mass reproduction in the biological laboratory of the ovarian parasite of Lepidoptera - Trichogramma, in particular, the species Trichograma evanescens Wes, which is widely represented in the nature of Uzbekistan. against the dangerous pest of cotton bollworm. In Uzbekistan, much attention is paid to the use of the biological method, in particular entomophages, which, in contrast to the chemical method, is characterized by safety for the environment and high biological efficiency reaching 65-70%. The article describes the technology of reproduction of trichogramma in a biological laboratory on the eggs of natural hosts of the entomophage.