Length 1.9-2.3mm. Alate (winged) females are generally pale blue-green, yellow mottled with green, or light yellow.

Unless identified by a recognised expert, a photo is required and the specimen should be examined with a microscope. In the comments box, state the key or ID method used and describe the size and identifying characters.

Found on English oak (Quercus robur), more rarely on other oaks.

Unknown.

Unknown.

https://influentialpoints.com/Gallery/Tuberculatus_borealis_Blue-green_oak_aphid.htm