Several scarab beetle larvae infest managed turf in Oklahoma, including the Japanese beetle, Popillia japonica, species of masked chafers, Cyclocephala, and May/June beetles, Phyllophaga. Although Phyllophaga larvae infest turf, relatively little is known about the actual species complex, including their relative abundance and damage potential in managed turf grasses in Oklahoma. A study was initiated to evaluate the occurrence, damage potential and species complex of Phyllophaga beetles that infest turf grasses. Black light traps were established on seven golf courses that represented diverse ecological conditions in Oklahoma, and beetles were collected 1-2 nights each week from April through August. The species complex and seasonal occurrence of Phyllophaga beetles collected during 2005 will be presented. This data will help to improve integrated pest management programs in managed turf systems.