Abstract
Shortly after the discovery of the introduction of balsam woolly adelgid,Adelges piceae(Ratzeburg), to the south coast of British Columbia, a predator release program was initiated to establish a complex of European and Asian adelgid predators to supplement existing native predators. Between 1960 and 1969, eight species of exotic predators,Aphidoletes thompsoniMohn (Diptera: Cecidomyiidae),Cremifania nigrocellulataCzerny andLeucopis hennigrataMcAlpine [=Leucopissp. nr.melanopusTanas. (McAlpine 1978)] (Diptera: Chamaemyiidae),Laricobius erichsoniiRosenhauer (Coleoptera: Derodontidae),Aphidecta obliterata(L.),Scymnus (Pullus) impexusMulsant, andScymnus (S.) pumilio(Weise) (Coleoptera: Coccinellidae), andTetraphleps abdulghaniGhauri (Heteroptera: Anthocoridae), were released (Clark et al. 1971; Schooley et al. 1984).