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Tuberculatus borealis

Blue-green oak aphid

Identification & Distribution  Other aphids on the same host 

Identification & Distribution:

Winged viviparae of Tuberculatus borealis are pale blue-green, yellow mottled with green, or yellow, with blackish-banded antennae. The terminal process of the sixth segment of the antennae is 0.9-1.3 times the length of the base of that antennal segment. Abdominal tergites 1- 4 each have a pair of spinal processes, but those on tergite 4 are sometimes very small (these processes are difficult to see on live specimens). The siphunculi are only apically dark (rarely over more than the distal half). The body length of Tuberculatus borealis alates is 1.9-2.3 mm.

The blue-green oak aphid is found on English oak (Quercus robur), more rarely on other oaks. Tuberculatus borealis is found across northern Europe into western Russia and east to Iran. It has been introduced to North America.

 

Other aphids on same host:

Blackman & Eastop list about 225 species of aphids  as feeding on oaks worldwide, and provides formal identification keys for aphids on Quercus.

Of the 34 species on common or pedunculate oak (Quercus robur), Baker (2015)  lists 15 as occurring in Britain: Hoplocallis picta,  Lachnus longirostris,  Lachnus roboris,  Moritziella corticalis, Myzocallis boerneri,  Myzocallis castanicola,  Phylloxera glabra, Stomaphis quercus,  Stomaphis wojciechowskii, Thelaxes dryophila,  Thelaxes suberi,  Tuberculatus annulatus, Tuberculatus borealis,  Tuberculatus neglectus and Tuberculatus querceus.

Acknowledgements

We have made provisional identifications from high resolution photos of living specimens, along with host plant identity. In the great majority of cases, identifications have been confirmed by microscopic examination of preserved specimens. We have used the keys and species accounts of Blackman & Eastop (1994)  and Blackman & Eastop (2006)  supplemented with Blackman (1974) , Stroyan (1977) , Stroyan (1984) , Blackman & Eastop (1984) , Heie (1980-1995) , Dixon & Thieme (2007)  and Blackman (2010) . We fully acknowledge these authors as the source for the (summarized) taxonomic information we have presented. Any errors in identification or information are ours alone, and we would be very grateful for any corrections. For assistance on the terms used for aphid morphology we suggest the figure  provided by Blackman & Eastop (2006).

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