Epigeic beetle (Coleoptera) communities in summer barley agrocenoses

The species composition, structure of dominance, abundance and activity density dynamics of epigeic beetles in different managed (Conventional: without insecticides, Conventional: with insecticide treatment, Ecological: without biopreparation treatment and Ecological: with preparation made on the basis of plant extraction treatment) summer barley fields has been discussed. Some species were detected in Lithuanian agrobiocenoses for the first time, namely Calosoma maderae auropunctatum, Cilyndera germanica, Pterostichus macer. The index of species diversity (H') in the studied fields differed insignificantly and was from 2.4 in conventionally managed summer barley to 2.61 in ecologically managed fields, with a dominance index (d) - from 0.27 to 0.19 respectively. A few eudominants have been detected throughout the study in all research sites: Poecilus cupreus (24 -16%), Pterostichus melanarius (21 - 28%) and Harpalus rufipes (13 - 18%). A negative influence of the insecticide aktara (tiametoksam 250g/kg) was observable on almost all species of epigeic beetles, however, the differences were not equally tendentious. No tendentious differences in the beetle communities were ascertained between ecological fields, differing in the application of preparation made on the basis of plant extraction.