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Longicaudus trirhodus

Rose - columbine aphid

On this page: Identification & Distribution  Other aphids on the same host 

Identification & Distribution:

Longicaudus trirhodus is a pale yellowish-green aphid with slightly darker green transverse bands across the abdomen. The third antennal segment is distinctly longer than the total length of the fourth and fifth antennal segments. The siphunculi are cone-shaped with dark tips and much shorter than the cauda. The cauda is long and finger-like much longer than its basal width. The body length of Longicaudus trirhodus apterae is 2.0-2.7 mm. The winged form has an irregular black mark on the abdomen.

The winged form (second picture above) has an irregular black mark on the abdomen.

The images below show alate Longicaudus trirhodus, dorsal and ventral, in alcohol.

The clarified slide mounts below are of adult viviparous female Longicaudus trirhodus : wingless on the primary host, on the secondary host, and winged.

Micrographs of clarified mounts  by permission of Roger Blackman, copyright AWP  all rights reserved.

The rose - columbine aphid host alternates from rose (Rosa spp.) in winter and spring to cultivated columbine (Aquilegia vulgaris) and meadow rue (Thalictrum) in the summer. Longicaudus trirhodus is found Europe, Asia and North America.

 

Other aphids on same host:

Primary hosts

Blackman & Eastop list about 70 species of aphid  found feeding on Rosa (rose) species worldwide, and provide formal identification keys. The genus Rosa contains perhaps a hundred species, plus hybrids thereof, and thousands of cultivated varieties of 'garden' & agricultural roses. Blackman & Eastop (1984)  list thirty-or-so species of aphids that feed on cultivated 'roses', worldwide.

Of those aphid species, Baker (2015)  lists 12 as occurring in Britain: Chaetosiphon fragaefolii,  Chaetosiphon tetrarhodum,  Longicaudus trirhodus, Macrosiphum euphorbiae,  Macrosiphum rosae,  Maculolachnus submacula,  Metopolophium dirhodum,  Myzaphis bucktoni,  Myzaphis rosarum,  Rhodobium porosum, Sitobion fragariae  and Wahlgreniella nervata. 

Secondary host

Blackman & Eastop list 9 species of aphid  as feeding on columbine (Aquilegia vulgaris) worldwide, and provide formal identification keys.

Of those aphid species, Baker (2015)  lists all 9 as occurring in Britain: Aphis fabae,  Aphis gossypii,  Aulacorthum solani,  Brachycaudus helichrysi,  Longicaudus trirhodus, Macrosiphum euphorbiae,  Myzus ascalonicus,  Myzus persicae  and Neomyzus circumflexus. 

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).

Useful weblinks 

References

  •  Blackman, R.L. & Eastop, V.F. (1984). Aphids on the world's crops: an identification guide. J. Wiley & Sons, Chichester, UK.