In the article a special attention is concentrated on the results of the research on the formation of entomoacarafauna of granaries of Belarus, taking into account the ecological (food) factor. For the first time, the species richness was analyzed, taking into account the ratio of the number of stock pest species and their number in warehouses where grain of wheat, barley, triticale, oats, and rye is stored. A comparison of species richness indices is shown: for wheat, the maximum value is set (1,53 points), for rye - the minimum one (0,93 points). For the first time, the density (abundance) of each pest species formed in technocenoses was calculated taking into account fodder preferences. The regularity of formation of the dominance structure of pests in granaries under the influence of their food preferences was observed. Acariformes were found regardless of the stored crop and were eudominant (58,3–100 %). The dominant species from Coleoptera were lesser grain borer (29,2 %) and grain beetle (16,7 %) for stored wheat, white marked spider beetle (19,0 %) for stored triticale, lesser grain borer (14,6 %) for stored barley and rice weevil (18,1 %) for stored oats. The Copeognata was characterized as subrecedent only for barley (0,7 %) and oats (1,0 %). The identified trends must be taken into account when taking protective actions in warehouses.
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