Comparison of various methods monitoring insect diversity in sown flower strips and neighboring fields of winter wheat and winter oilseed rape

In this study we deal with comparison of insect monitoring methods on flowering strip, wheat and oilseed rape. The experiment is located at two study sites: Crop Research Institute at Ruzyně and Experiment unit of Czech University of Life Sciences in Uhříněves. The experiment was carried out in 2015. To make monitoring we utilized sweeping net, Möricke yellow traps, transect counting and as a supplementary method we utilized light trap. Monitoring was done in 25 of June, 16 of July and 12 of August 2015. These dates were chosen because of flowering of the strip which was the most important issue in this study. As a result of this the insect diversity in other almost harvested variants was quite low. The most important insect species quantities were collected from Möricke traps in all three variants. But this fact could be naturally based on the attractivity of the yellow color, so we can´t reliably say, if in out of bloom rape or wheat could be present this high amount of insect or if it is only being attracted by color of the trap from the neighborhood. The second method with the highest insect occurrence was sweeping net. Again the highest species diversity was described from the flowering strip. The lowest amount of insects was noted in transect counting. This method has (contrastingly to the others) disadvantage in the high possibility of fail to detect small insect, which are normally noticed by the other methods. Light trap monitored about the highest species number, where the majority of species belong to order Lepidoptera. That sway this method was employed only to enrich the species diversity