R. G. Mitchell

• Balsam woolly aphid
• Damage by the Sitka spruce weevil (Pissodes strobi) and growth patterns for 10 spruce species and hybrids over 26 years in the Pacific Northwest
• Estimation of needle populations on young, open-grown Douglas-fir by regression and life table analysis
• Infestation characteristics of the balsam woolly aphid in the Pacific Northwest
• Balsam woolly aphid predators native to Oregon and Washington
• Field test of acephate against two Douglas-fir Christmas tree pests
• Port Elliot
• Susceptibility of 10 spruce species and hybrids to the white pine weevil (=Sitka spruce weevil) in the Pacific Northwest
• Translocation of dye in grand and subalpine firs infested by the balsam woolly aphid