Contents: By Damage and Image
Sawflies on Douglas fir - Balsam fir sawfly
Neodiprion scutellatus is a sawfly found on Douglas fir and listed in references such as Western Forest Insects. But some entomologists call the sawfly found locally on Douglas fir by another name, balsam fir sawfly (Neodiprion abietis complex). The complex apparently has 5 strains separated by geography and host: 4 in the Eastern US (2 on balsam fir, 1 each on white and black spruce) and 1 in the West. The host list for the Western strain includes: Pacific silver fir, subalpine fir, Engelmann spruce, Sitka spruce, and Douglas-fir. The sawfly larvae images at this website more closely resemble the Neodiprion abietis images pictured at the Symphya website. As most sawfly identification is based on adult specimens, only a successfully-reared adult will confirm the true identity of these particular sawflies.
Sawflies can defoliate plants if occurring in large numbers. Damage from this pest is usually localized and may not require control or spot applications only. There are many natural controls (weather, parasites, diseases) that usually keep these populations in check. Images of the sawfly and damage can be found below right side of page.
Balsam fir sawfly, Nova Scotia Natural Resources
Symphyta photos: Neodiprion scutellatus
2005 Forest Health Highlights in Oregon - cover shot shows damage.
Original version: <25 May 2010)
Last update <20 February 2017>
Author: R.L. Rosetta, Extension Nursery Integrated Pest Management, Department of Horticulture, Oregon State University/NWREC.