Seasonal phenology and abundance ofLeucopis argenticollis, Leucopis piniperda(Diptera: Chamaemyiidae),Laricobius nigrinus(Coleoptera: Deridontidae) andAdelges tsugae(Hemiptera: Adelgidae) in the Pacific Northwest USA

Adelges tsugae infested western hemlock trees were sampled periodically for 1 year at two locations in Oregon and Washington to compare the phenology and abundance of three associated predators ( Leucopis argenticollis, Leucopis piniperda , and Laricobius nigrinus ) and their host. On each sample date, two 3–10 cm long terminal twigs were collected from each tree and brought to the laboratory to count all life stages of A. tsugae and the three...