1959. Larval drawings of the native balsam woolly adelgid predator Syrphus opinator: A, dorsal view of 3rd instar larva; B, lateral view of 3rd instar larva; C, 3rd instar mouth-hooks; D, segmental spine of 3rd instar; E, 3rd instar spiracular plate.

Larval drawings of the native balsam woolly adelgid (Chermes) predator Syrphus opinator O.S.: A, dorsal view of third instar larva (13x); B, lateral view of third instar larva (13x); C, third instar mouth-hooks (54x); D, segmental spine of third instar larva (145x); E, third instar spiracular plate (120x).

 

Artist: Russ G. Mitchell

Photo by: Wally C. Guy

Date: 1959

 

Credit: USDA Forest Service, Pacific Northwest Region, State and Private Forestry, Forest Health Protection.

Collection: Portland Station Collection; La Grande, Oregon.

Image: PS-2356

 

For additional historic forest entomology photos, stories, and resources see the Western Forest Insect Work Conference site: wfiwc.org/content/history-and-resources

 

Image provided by USDA Forest Service, Pacific Northwest Region, State and Private Forestry, Forest Health Protection: www.fs.usda.gov/main/r6/forest-grasslandhealth

Done