Norman E. Johnson

• A test of ten insecticides for controlling the hemlock looper
• Ambrosia-beetle infestation of down coniferous timber in Benton County, Oregon
• Distribution of Sitka spruce weevil eggs on leaders of open grown Sitka spruce in southwest Washington
• Douglas-fir cone insects and their control
• Effectiveness of three systemic insecticides for Douglas-fir cone and seed insect control
• Report on sanitation-salvage beetle control in the Ponderosa pine forests of the Pacific Northwest
• The balsam woolly aphid on young Pacific silver fir in Washington
• The balsam woolly aphid problem in Oregon and Washington