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Aphidinae : Macrosiphini : Aulacorthum ibotum
 

 

Aulacorthum ibotum

Brown-blotched privet aphid

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

Identification & Distribution

Adult apterae of Aulacorthum ibotum are yellow to pale green with brown marginal markings, and no wax (cf. Aphis crinosa on Ligustrum in the Far East, which has thick white wax secretions). See picture below for yellow form (for green form see Mushinavi). Antennal segments I-IV are pale or dusky with dark bases and apices, segments V is dark with a dusky base and VI is dark, with 0-3 secondary rhinaria on segment III. The rostrum reaches nearly to the third coxae. The thoracic dorsum and abdominal dorsum are mottled with brown patches laterally and around the siphunculi (not visible in clarified mounts). The legs are yellowish except for dark brown apices to the femora and tibiae, and black tarsi. The siphunculi are uniformly black (cf. Myzus ligustri, which have the basal half of the siphunculi pale and distal half dark); they are less than twice the caudal length, and 0.220.26 times as long as the body. The cauda is pale (cf. Aphis spiraecola, which has a dark cauda). The body length of adult Aulacorthum ibotum apterae is 1.8-2.3 mm. Immatures are paler in color than the adults, with the wingpads dusky.

Image above by permission, copyright Akihide Koguchi, all rights reserved.

Alate Aulacorthum ibotum are pale green with mainly dark antennae. The terminal process is 8-9 times the length of the base of antennal segment VI. Antennal segment III bears 13-16 secondary rhinaria, which are circular, about the same size, and almost in a row. Sensoria on other segments are normal. The rostrum reaches nearly to the third coxae. The prothorax is yellowish, with the remainder of the thorax dark. The legs are yellow, with the distal ends of the femora and tibiae, and all of the tarsi black. The siphunculi are dark and imbricated throughout, about twice as long as the dark cauda.

Aulacorthum ibotum feeds on the undersides of leaves of privet (Ligustrum species). Their life cycle has not been fully investigated, but Takahashi (1960) reported that wingless oviparae and winged males were collected, presumably on privet, on November 29, 1919, near Tokyo. This strongly suggests that the species is monoecious holocyclic. It is found in Japan and Korea.

 

Other aphids on the same host

Aulacorthum ibotum has been recorded on 2 Privet species (Ligustrum ibota, Ligustrum obtusifolium).

Acknowledgements

We are especially grateful to Akihide Koguchi for allowing us to reproduce the images of Aulacorthum ibotum from his blog page.

We have used the keys and species accounts from Essig & Kuwana (1918) and Takahashi (1923) along with information from Roger Blackman & Victor Eastop in Aphids on Worlds Plants. 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

  • Essig, E.O. & Kuwana, S.I. (1918). Some Japanese Aphididae. Proceedings of the California Academy of Science Series 4 8 (3), 35-11. p 2. Full text

  • Takahashi, R. (1923). Aphids of Formosa. Part 2. Report of the Department of Agriculture Government Research Institute Formosa 4: p70. Full text