Utah State University Extension
The Japanese beetle, Popillia japonica Newman, can be a highly destructive pest to ornamentals, trees, shrubs, turfgrass, and vegetables. First discovered in the eastern United States in 1916, the Japanese beetle has threatened agriculture and horticulture by slowly moving south and west. In 2006, a small population of adult Japanese beetles was detected in Orem, Utah.
Hodgson, Erin; Alston, Diane; and Stanley, Cory A., "Japanese Beetle" (2010). All Current Publications. Paper 919.