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Aphidinae : Macrosiphini : Macrosiphum pallidum
 

 

Macrosiphum pallidum

Pink wild rose aphid

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

Identification & Distribution

Adult apterae of Macrosiphum pallidum are pink or green (see picture of pink form below), with the antennae, femoral apices, tibiae, and tarsi dark (cf. Macrosiphum impatientis, which has antennal segment III mainly pale, and the tibiae with pale middle sections). The head is dusky, much paler than the siphunculi (cf. Macrosiphum rosae, which has the head as dark as the siphunculi). The eyes are reddish brown, much paler than usual in this genus. The antennae are much longer than the body, with a terminal process about 6 times the base of antennal segment VI. Antennal segment III bears 3-14 secondary rhinaria. Abdominal tergites VII & VIII each usually have a pair of spinal tubercles (cf. Macrosiphum impatientis, which does not usually have spinal tubercles on VII & VIII). The siphunculi are dark, except at the extreme bases (cf. Macrosiphum rosae, which has the siphunculi entirely dark). The siphunculi are long, thicker at the base, 1.2-1.7 times the caudal length, but they are not longer than (0.73-0.95 times) as long as antennal segment III (cf. Macrosiphum valerianae, which has siphunculi 1.03-1.30 times antennal segment III). The cauda is long and pale. The body length of adult Macrosiphum pallidum apterae is 2.1-4.6 mm.

First image above copyright David Voegtlin, Discover Life; second image above copyright Aphidnet;
both under a Creative Commons License.

Alatae of Macrosiphum pallidum (see picture of clarified mount below) have 14-22 secondary rhinaria on antennal segment III.

Image above copyright Aphidnet under a Creative Commons License.

Macrosiphum pallidum is most commonly found on various wild rose (Rosa) species and various other members of the rose family (Rosaceae) including agrimony (Agrimonia), strawberry (Fragaria), Geum, and Potentilla). It is also apparently able to colonise a wide range of other plants, such as Eupatorium (Asteraceae), Cicuta (Apiaceae) and Chenopodium (Chenopodiaceae). It has not been implicated in the transmission of any plant virus. The life cycle is unknown. Macrosiphum pallidum is widespread in North America.

 

Other aphids on the same host

Previous workers do not seem to have recorded which species of 'wild rose' (Rosa) Macrosiphum pallidum feeds on.

Macrosiphum pallidum is recorded from 2 Geum species (Geum canadense, Geum virginianum).

Acknowledgements

We are grateful to David Voegtlin and AphidNet for making their images of Macrosiphum pallidum available for use under a creative commons licence.

We have used the species account given by Oestlund (1887) (as Nectarophora pallida), 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

  • Oestlund, O.W. (1887). Synopsis of the Aphididae of Minnesota. Bulletin of the Geological and Natural History Survey of Minnesota 4 p.60. Full text