[Bowser et al sequenced genomes of galls similar to Rabdophaga rosaria found on Salix pulchra and fuscescens and found they clustered with sequences from R rosaria on Salix purpurea in Poland. They "tentatively identify Alaskan members of this clade as Rabdophaga cf rosaria," but state that "Alaskan specimens of Rabdophaga cf. rosaria were different enough from the one Old World sequence of R. rosaria that they may represent separate species."]

[Sato et al report that Rabdophaga rosaria midges collected on Salix pulchra in Alaska are monophyletic with midges collected from similar galls in Eurasia. They note that the genetic distance between two clades of R rosaria are sufficient to suggest they have diverged as sister species, but the clade including the Alaskan midges is also found in Poland, Russia, Korea, China, and Japan.]