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Aphidinae : Macrosiphini : Macrosiphoniella ludovicianae
 

 

Macrosiphoniella ludovicianae

White sage aphid

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

Identification & Distribution

Adult apterae of Macrosiphoniella ludovicianae (see first picture below) are green or yellowish green, dusted with greyish white wax. The antennae are dusky yellow on segments I & II, and on the base of segment III, and blackish or black beyond the base of III. The rostrum reaches beyond the third pair of coxae, with the apical rostral segment (RIV+V) roughly equal in length to the second hind tarsal segment (HTII). The femora have the apical regions dusky, much like the tibiae (cf. Macrosiphoniella paucisetosa in Canada, which have the femora entirely pale contrasting with wholly dark tibiae). The siphunculi are mostly black, but with a dusky base, and are distinctly longer than the cauda (cf. Macrosiphoniella artemisiae and Macrosiphoniella tanacetaria, both of which have all black siphunculi which are 0.6-0.9 times the caudal length). The cauda and anal plate are dusky greenish-yellow (cf. Macrosiphoniella artemisiae and Macrosiphoniella tanacetaria, which both have a black cauda). The cauda is spatulate, bearing 7-8 lateral pairs of hairs and 4-5 dorsal ones. The body length of adult Macrosiphoniella ludovicianae apterae is 2.0-2.8 mm.

First image above copyright Jesse Rorabaugh, no rights reserved;
second image copyright Andrew Jensen, under a creative common licence.

Alate viviparous females of Macrosiphoniella ludovicianae (see second picture above) are similar in colouration to the apterous forms except that the head and thorax are dusky-green, and the hairs are slightly shorter.

The first picture below shows a clarified slide mount of an apterous vivipara of Macrosiphoniella ludovicianae; the second picture shows a live adult with immatures.

First image above copyright Jesse Rorabaugh, no rights reserved;
second image copyright M.J. Hatfield under a creative common licence.

Macrosiphoniella ludovicianae is monoecious holocyclic on the leaves of Artemisia ludoviciana, but has also been recorded from common mugwort (Artemisia vulgaris). The species is generally common in a wide range of habitats. Oviparae and alate males occur in October. This native North American species is widely distributed in USA and Canada.

 

Other aphids on the same host

Blackman & Eastop list 11 species of aphid as feeding on white sage, prairie sage, western mugwort (Artemisia ludoviciana) worldwide, and provide formal identification keys (Show World list). Of those aphid species, Baker (2015) lists 3 as occurring in Britain (Show British list).

Acknowledgements

We are grateful to Jesse Rorabaugh, Andrew Jensen, and MJ Hatfield for making their images of Macrosiphoniella ludovicianae available for use under a creative commons licence.

We have used the species accounts given by Palmer (1952) (as Macrosiphum ludovicianae) and Jensen et al. (2020) together 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 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

  • Jensen, A.S. et al. (2020) A review of the aphid genus Macrosiphoniella del Guercio, 1911 (Hemiptera: Aphididae) in the USA with description of a new species. The European Zoological Journal 87(1), 412-443, Full text

  • Palmer, M.A. (1952). Aphids of the Rocky Mountain Region: including primarily Colorado and Utah, but also bordering area composed of southern Wyoming, southeastern Idaho and northern New Mexico. Thomas Say Foundation, Denver. Full text