Corn rootworm (Diabrotica virgifera virgifera LeConte) is brought to territory of Croatia from USA, where is the most important corn pest. In 1995 he was found in Bošnjaci and has since been considered one of the most important insects of the Croatian entomofaune. During the course of time corn rootwarm has spread to the entire growth area of corn, which is continental part of Croatia, and in the future it can be a great danger to the yield of this culture. Ecologically and economically most appropriate solution for avoiding a damage from corn rootworm is the integrated protection production of corn which implies corn cultivation in a crop rotation. During the vegetation in 2013 in the area of Vrbje in Brod Posavina County, the occurrence of corn rootworm was observed and a risk assessment for 2014 was carried out under conditions of repeated corn sowing. The study was conducted by placing Pherocon AM (PhAM) yellow plates on three corn fields in a repeated corn sowing. The height of the pests population was observed in the period from 7th July 2013 to 1st September 2013. It was found that the population of corn rootworm was low and that the maximum weekly catch was below the tolerance threshold level.