Commercial filbert orchards throughout the Willamette Valley
were surveyed for natural enemies of the filbert aphid, Myzocallis
coryli (Goetze). A large number of predaceous insects were found to
prey upon M. coryli, particularly members of the families
Coccinellidae, Miridae, Chrysopidae, Hemerobiidae, and Syrphidae.
Also, a parasitic Hymenopteran (Mesidiopsis sp.) and...