We realized a faunistic research of praticol insects associated with an economically crop of oilseed rape (Brassica napus). The research areas were represented by two field sites located in the extravilan of the village Pastuchov (Hlohovec district, SW Slovakia). The etomological material was collected by the method of impact glue traps without pheromone effect during the vegetation period 2019 (from April to Jul). Total recorded insects represented 5823 ex. and 32 species belonging to 8 generas and 29 families. The Hemiptera, Hymenoptera, Lepidoptera (12,5 %), Coleoptera (25,0 %), Diptera (28,13 %) were the eudominant generas. At the site A affected by insecticidal spraying, we record 2318 ex. and 28 species. The control station (B) without chemical influence showed a more numerous representation with 3505 ex. and higher diversity with 32 species. The ecological stability of the compared field habitats with the oilseed rape crop is also indicated by the Shannon - Wiever diversity index, (d <2.0; dA = 1.66799 vs. dB = 1.74520). The difference of the application of chemical sprays on both stations which shows the high value, which indicates an ecologically balanced, stabilized and zoocenotically balanced type of field habitat.