PCR amplification of Dendrocerus carpenteri DNA using primers DcarpF and DcarpR yielded a 341 bp fragment. Lanes 1 and 14, 100 bp DNA ladder; Lane 2, D. carpenteri; Lane 3, Alloxysta xanthopsis from Prosser, WA; Lane 4, Lysiphlebus testaceipes from Whitman County, Washington; Lane 5, L. testaceipes from Payne County, Oklahoma; Lane 6, Schizaphis graminum; Lane 7, Diuraphis noxia; Lane 8, Rhopalosiphum padi; Lane 9, Sipha flava; Lane 10, R. maidis; Lane 11, Sitobion avenae; Lane 12, DNA mix of D. carpenteri, L. testaceipes and R. padi; Lane 13, DNA mix of A. xanthopsis, L. testaceipes and R. padi.