During last years investigations cowering the elaboration of new systems of integrated plant protection became more active by utilization biorational means of plant protection, and electro optic installations. A great attention is accords to elaboration and selection of sour-ces- attractants and new electro optic structures whice must show a high attractively due to a specific irradiation spectrum and, thus, provide a maximum trapping of harmful insects. Application of the light traps is a more perfect method for phenology investigation of many important, in an economic aspect plant pest, and results of insects gathering can by used for elaboration short-term prognoses of insect pests development for rendering more precise the terms for craning out of protection measures. Further the light traps for insect can be used as an independent mean for plant pest combating. Purpose. The existing methods of capturing and collecting harmful insects for the purpose of forecasting and monitoring their development do not ensure the availability of complete data on the species and the density of pest populations. At the same time, many insect species cannot be identified using these methods. Much more effective are the capture methods with the use of ultraviolet radiation sources. The effect of attracting harmful insects with this bait allows to elaborate a variety of trap models, based on the use of light sources with a certain wavelength.  Given that more attention is currently being paid to ecological methods of combating pests of agricultural crops, the need has arisen to carry out scientific research activities on the development of new models of multifunctional traps with an ultraviolet light source, with a pronounced effect of attracting harmful noctuid insects.  When designing and calculating the basic parameters, the optimal exposure value, the spectral range of the radiation source - of the decoy, as well as the constructive parameters of the device were taken into account. Experimental models of elaborated devices depend, first of all, on their intended purpose and destination. Thus, for signaling the appearance of pests, monitoring their development, determining their density in the given agrocenosis, devices are needed, which ensure the maintenance of the specific appearance of the captured specimens in order to study and classify them by species and groups. It is particularly important to fulfill this condition, to signal the appearance of quarantine pests and to take all measures to limit their spread in time.