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Aphis idaei

Small raspberry aphid

Identification & Distribution 

Identification & Distribution:

Viviparous apterae and alatae are small mottled green and yellow aphids with a rather even wax pulverulence giving an overall pale green colour. The abdominal dorsum in apterae is quite pale. Alatae have dark marginal and postsiphuncular sclerites and bands across tergites 7-8. The species is characterized by the combination of long very slender dusky siphunculi and a short thick blunt cauda. In apterae the siphunculi are 2.4-3.3 times the length of the cauda in apterae and 2.1-2.7 times in alates. In midsummer the progeny develop into dwarf apterae which live dispersed between the veins of the underside of the leaves. The body length of apterae is only 1.3-2.2 mm (dwarfs 0.8-0.9 mm) and of alatae 1.5-1.9 mm.

 

The small raspberry aphid does not host alternate. It only feeds on raspberry (Rubus idaeus) causing strong leaf curl in early summer. It is considered one of the most damaging pests of raspberry canes (Gordon et al. (1997) ). Sexual forms occur in autumn with apterous males. It occurs through most of Europe, west Siberia and in New Zealand and North America.

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. (2006) Aphids on the World's Herbaceous Plants and Shrubs. Vols 1 & 2. J. Wiley & Sons, Chichester, UK. Full text 

  •  Gordon, S.C. et al. (1997). Arthropod pests of Rubus: pest status, current and future control strategies. Journal of Horticultural Science 72 (6), 831-862. Abstract