Sugar beet (Beta vulgaris L., saccharifera variation) is an intensive, profitable crop, which efficiently harnesses water and fertilizers. It is used as a raw material in the sugar industry from the processing of sweet rhizocarps to obtain sugar, molasses and other secondary products, strictly necessary for the food, pharmaceutical, chemical and zootechnical industries.  The capitalizing of this crop using intensive agriculture and on large areas in the last decade, significantly aggravated the state of agrocenoses and led to the accumulation of harmful insects, which annually invades the lands planted with sugar beet and causes serious damage to plants frequently and abundantly throughout the vegetation period. The actuality of the researches imposes the purpose and the objectives of the investigations, which constitutes the accomplishment of the entomological phytosanitary monitoring with the detection of the diversity, the density of the numerical herd, the establishment of the phytoparasitic impact of the associations of parasitic insects to the sugar beet, for argumentation, the use of remedial measures in the application of the integrated protection system. The entomological samples were collected seasonally from experimental and productive sectors of sugar beet during 2018-2019 years, in the northern regions of the country - districts Balti, Glodeni, Drochia and Sangerei. Estimation of the insects species diversity, their quantitative structure and trophic specialization, were performed in the Entomology Laboratory of the Institute of Zoology. Entomological phytosanitary surveys were conducted at the sugar beet, with the collection of entomofauna and the analysis of over 300 soil and affected plants samples, applying the approved methods and protocol in the laboratory.Initially from germination to the formation of the leaf rosette, the species of harmful insects with poly-oligophagous specialization appear in a consecutive order, such as: leaf guards-Tanymecus dilaticolis Gyll., Tanymecus palliates Germar., Bothynoderes punctiventris Germar., fam. Curculionidae, sugar beet fleas - Chaetocnema spp. Stephens, 1831, fam. Chrysomelidae, accompanied by wire larvae of beetles of the genus Agriotes lineatus L., A. ustulatus L., A. obscurus L., fam. Elateridae, the beetle - Opatrum sabulosum L., fam. Tenebrionidae, larvae of May bug - Melolontha melolontha L., fam. Scarabaeidae. All cited insect pests belonging to the order Coleoptera. Among them we can notice the caterpillar of the species Agrotis segetum Schiff., Autographa gamma L. and Agriotis exclamationis L., fam. Noctuidae, ord. Lepidoptera. This is also favorable period for the aphid species such as Aphis fabae Scopoli and Myzodes persicae Sulzer, fam. Aphididae, ord. Homoptera. In the phase of formation and maturation of sweet roots (the second period of vegetation) on sugar beet plants, the other species of pests such as larvae of beetle flies - Pegomya betae Panz & Curtis, fam. Anthomyiidae, ord. Diptera and larvae of the beet moth - Scrobipalpa ocellatella, Boyd., fam. Gelenchiidae, ord. Lepidoptera are associated. These noted pests significantly affected the sugar beet plants with severe parasitic impact, established in average values of 3-25% the frequency of attack and 5-28% the intensity of the diseases caused on both the roots and the aerial organs. Preliminary results of investigations of harmful entomofauna in sugar beet culture revealed 17 species of insects from 8 families and 4 orders, which form various complexes of harmful insects and with varied trophic specialization that cause serious malformations of the foliar apparatus and rhizocarps. These investigations have major significance in monitoring the ecological status in sugar beet agrocenoses to remedy the phytoparasitic impact and integrated plant protection. The investigations were carried out within the framework of the fundamental intentional project with the figure 15.817.02.12F and the STCU-6233 project within the Program of the strategic direction Joint Research and Development Initiatives, with the number 17.80013.5107.12 / 6233, for the year 2019.