Damage by the Sitka Spruce Weevil ('Pissodes strobi') and Growth Patterns for 10 Spruce Species and Hybrids Over 26 Years in the Pacific Northwest

摘要

Ten species and hybrids of spruce (Picea spp.) were planted and observed annually for 26 years at three coastal locations in Oregon and Washington to evaluate growth rates and susceptibility to the Sitka spruce weevil (white pine weevil), Pissodes strobi. The 10 spruce were: Sitka spruce, Norway spruce, Lutz spruce, black spruce, white spruce, Engelmann spruce, Yeddo spruce, Sakhalin spruce, an Engelmannxwhite spruce cross, and a Sitka x white x white backcross. Results showed Sitka and Norway spruce grew well but were badly damaged by severe weevil attack. The other species and hybrids had very little weevil damage, but survival and growth were poor.