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Few persons not engaged in the nursery business realize the number, variety and seriousness of the insects that attack the nursery trees, shrubs and plant-ing stock, or the care and skill necessary to protect them from the ravages of the insect pests. This bulletin entitled "Insect Pests of Nursery and Ornamental Trees and Shrubs in Oregon " is in-tended as a nurserman's handbook of insects affecting his plantings. An attempt has been made to present the essential facts that will assist the nurseryman to recognize his insect enemies and to apply intelligently control measures that will protect his plantings from insect attack and damage. We still need more knowledge about certain nursery insects and how to deal with them. This is especially true in the use of new insecticides. Insect control prac-tices are passing through revolutionary changes due to the advent of many new and powerful insecticides and methods of application. Admittedly the use of these new materials is still in the experimental stage and cannot be included in this publication. Research on the use of these new materials and methods of applica-tion will be carried on and the results released as fast as time and personnel available will permit