Abstract: This publication, developed to aid the public and professionals in identifying and managing common insect pests of trees in the Great Plains, provides information on hardwood and conifer defoliators, borers, sapsucking insects and gall insects: their hosts, identification, life cycle, and damage and control recommendations. Color photos aid in pest identification. Contains a list of insecticides by common and registered trade names, a list of host plants by common name with scientific names, and common and scientific names of insect pests arranged by the damage they cause.