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Aphidinae : Aphidini Braggia columbiana
 

 

Braggia columbiana

Arrowleaf buckwheat aphid

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

Identification & Distribution

Adult apterae of Braggia columbiana (see first picture below) are black or blackish-brown with a white or whitish-gray pattern of wax on the dorsum. Their appendages are brownish-black to brown, except for a pale basal half of antennal segment III, pale middle areas of front femora and tibiae, and a dusky cauda. The dorsal integument is faintly to moderately reticulate on the head and abdominal dorsum. The antennal tubercles are weakly developed. The antennae are short, 0.51-0.83 times the body length, with the terminal process 1.77-2.90 times the base of antennal segment VI. The longest hair on antennal segment III is slightly longer than basal diameter of that segment. There are usually secondary rhinaria on antennal segments III-V (cf. Braggia longicauda, which usually has no secondary rhinaria on these segments). The rostrum extends to the metacoxae, and the apical rostral segment is 0.19-0.24 mm long with 2 accessory hairs (cf. Braggia agathona & Braggia eriogoni, which have RIV+V usually less than 0.19 mm long). The first tarsal segments all have 2 hairs. There are marginal tubercles on the pronotum, and abdominal tergites I & VII. The siphunculi are imbricated, subcylindrical, tapering and flanged. The cauda is wider than long, with a total of 5-15 hairs. The body length of adult Braggia columbiana apterae is 1.41-2.56 mm. Immatures are black with transverse stripes of whitish wax.

First image above copyright Andrew Jensen, second image copyright Ken Chamberlain,
both under a cc by-nc-sa licence.

Alate Braggia columbiana viviparae (not pictured) have secondary rhinaria on antennal segments III-V. The abdominal tergites have definite pigmented marginal spots and usually transverse dark stripes.

Braggia columbiana is monoecious on buckwheat (Eriogonum spp.), predominantly Eriogonum compositum (see second picture above), less commonly Eriogonum umbellatum and infrequently on Eriogonum elatum, Eriogonum pyrolifolium, and Eriogonum strictum. It is assumed to be holocyclic, but sexual morphs are so far undescribed. It is presently known only from Oregon and Washington states, USA.

 

Other aphids on the same host

Braggia columbiana is recorded from 5 species of buckwheat (Eriogonum compositum, Eriogonum elatum, Eriogonum pyrolifolium, Eriogonum strictum, Eriogonum umbellatum).

Acknowledgements

We are grateful to Andrew Jensen and Ken Chamberlain for making their pictures available for use under creative commons licences.

We have used the keys and species accounts of Pike (2009) along with information from Roger Blackman & Victor Eastop in Aphids on Worlds Plants. We fully acknowledge these authors and those listed in the reference sections 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

  • Pike et al. (2009). New species of Braggia (Hemiptera: Aphididae) on buckwheat in western North America. The Canadian Entomologist141(6), 561-581. Full text