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Rose - columbine aphidOn this page: Identification & Distribution Other aphids on the same host
Identification & Distribution:
The aptera of Longicaudus trirhodus is pale yellowish-green 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 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.
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:
Longicaudus trirhodus has been recorded from 20 Rosa species.
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 (Show World list). Of those aphid species, Baker (2015) lists 12 as occurring in Britain (Show British list).