Contents: By Damage and Image
White pine weevil
The white pine weevil, Pissodes strobi, is a key pest in conifer production. This is primarily due to its feeding damage to the terminal of conifers causing flagging and dieback. It most commonly attacks spruce in nursery production in the PNW.
The weevil larvae pupate in pupal chambers lined with sawdust under the bark and emerge as adults in mid-late summer. The adults feed in the trees until they return to the duff at the base of the tree to overwinter. There is one generation a year.
For chemical recommendations, check the nursery section at the PNW Insect Management Handbook.
Additional Web Resources
White pine weevil. USDA Forest Service Forest Insect & Disease Leaflet 21. A very thorough presentation on the biology, ecology, and management of white pine weevil with good images. The emphasis is silviculture but much pertains to nurseries.
The White Pine Weevil. Colorado State University
White Pine Weevil Fact Sheet. Penn State Woody Ornamental Integrated Pest Management
Gardosik, S. and R. Leyman. 2005. White Pine Weevil Detection Traps. PA Department of Agriculture. Instructions on how to use Tedder traps for detection of white pine weevil adult emergence.
Wilson, R. and E. Bechinski. Management of White Pine Weevil in Spruce. <4 March 2016>
Last revision <4 March 2016>
Author: R.L. Rosetta, Extension Nursery Integrated Pest Management, Department of Horticulture, Oregon State University/NWREC.