Plant and Soil Science

 The peculiarities of reproduction of the main pests on crops of cereal crops are highlighted and complex thresholds of harmfulness of soil phytophages are established. The analysis of the harmfulness of the modern plant of winter wheat, maize, rye, triticale in the forest-steppe of Ukraine was carried out. According to the indicators of seasonal and long-term dynamics of pest numbers, certain losses of grain yield. It is reasonable to understand the distribution of entomological objects in agrocenoses, which often has a contagious form, is reflected in the indicator "area of maximum severity", for example for soil phytophagous species, taking into account the radius of their daily movement. For the current conditions of crop management, it is actual to determine the total need of pests in the diet by the actual population of the species at different stages of ontogenesis of cereals, in a specific area, during a certain period of agrocenosis formation, taking into account the proportion of plant nutrition of the pest that varies with time. In the current conditions of agricultural development, highly effective use of advanced technologies and progressive systems for protecting crops from a complex of harmful organisms is of particular importance, and the formation and development of plants and the harvest of grain of wheat, rye, maize, triticale are adversely affected.Application in the production of models for calculating the integrated thresholds for the harmfulness of phytophages on crops of cereal crops, based on theoretical data on the dynamics of the number of insect larvae for different developmental periods, reliably (up to 92 %) allows quantitative changes in the entomocomplex in time and space. At the same time, the development and introduction of the harmfulness of soil phytophages into the production of micro and macropores is of particular importance, and it will be possible to determine the expected losses of cereals from pests in the forest-steppe of Ukraine

cereals, prognosis, agrobiocenosis, soil pests, complex thresholds of damage, measures for the protection of cereals