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Impact of various oilseed rape productions on biological potential of endogaeic active ground beetles (Coleoptera: Carabidae)

Ground beetles are one the most important family of arthropod predators in arable crops. Compared to central European countries that have list of most frequently predator species in oilseed rape fields, in Croatia nothing is known about ground beetles and their activity. The trial was set up on three different oilseed rape productions: conventional (ploughing, full seed dressing, intensive application of pesticides and fertilizers), integrated (mulching, no seed dressing, reduced input of pesticides and fertilizers, 3 m width trap crop strip along each side of the field) and organic (ploughing, no seed dressing, peas as pre-crop, entire field rounded with 3 m width trap crop strip, no fertilizers and pesticides applied). The aim of this research was to investigate endogaeic activity density of ground beetles and impact of different oilseed rape production on their apperance. Endogaeic traps were used for monitoring endogaeic activity and sampling predatory arthropods. Eight traps were put on each system and on integrated and organic trap crop strip were put four additional traps. During 2011 monitoring was conducted from 10th February till 30th June. Samples were taken every two weeks. Results show that level of endogaeic activity of ground beetles was the highest in organic production with 26, 5 ind/trap in the centre of the field and 27, 25 ind/trap in the trap crop strip. In the centre of the conventional field number of ground beetles individuals per trap was 21, 63. In integrated system level of endogaeic activity was the lowest with 7, 5 ind/trap in the centre of the field and 17, 25 ind/trap in the trap crop strip. This article provides results about endogaeic active ground beetles in different managed oilseed rape fields in Croatia.

endogaeic traps; ground beetles; oilseed rape; Croatia

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