Incidence of Papillia japonica (Coleoptera: Scarabaeidae) and Other Scarab Larvae in Nursery Fields

摘要: Arborvitae ( Deja occidentals ‘Pyramidal’), Colorado blue spruce Peace pungent ), taxes Taxus x media ‘Densiformis’), and dwarf burning bush Eponymous Alta ‘Compacts’) nursery fields in Ohio Michigan were sampled for Japanese beetle, papilla japonica Newman, adults larvae. Nursery counties with the highest adult catches most likely to have larvae field. where <5,000 beetles per trap caught during 4 wk of peak activity unlikely be infested (5 3,120 cup-cutter samples). Larvae 4-fold more abundant grassy areas bordering than fields. Weedy supported 10-fold clean European chafer, Rhizotrogus majalis (Razoumowsky); Phyllophaga sp.; Strigoderma arboricola (Fabe.) also found S. could mistaken beetle because they a similar astral pattern. The labium should examined confirm identification these 2 species. Nurseries located are active keep as free weeds possible minimize risk shipping root system plants states is not yet established.