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Aphidinae : Macrosiphini : Uroleucon rurale
 

 

Uroleucon rurale

Northern wingstem aphid

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

Identification & Distribution

Adult apterae of Uroleucon rurale are grass-green or (judging from these pictures) brownish green, with blackish antennae, legs, cauda and dark siphunculi, although the basal portions of the siphunculi sometimes appear slightly paler. Antennal segment III has 10-21 secondary rhinaria. The rostrum reaches the third pair of coxae, with the apical rostral segment (RIV+V) 1.2-1.56 times the second hind tarsal segment (HT II) (cf. Uroleucon verbesinae, which has RIV+V 1.6-1.9 times HT II). The dorsal hairs are without dark basal scleroites. Marginal tubercles are present on abdominal segments II, III, and IV. Dusky antesiphuncular and postsiphuncular sclerites are present, the former with associated marginal tubercles. Abdominal tergite VIII has 4, rarely 5, hairs. The siphunculi are longer than antennal segment III, and are more than 1.5 times the cauda, which is dark (cf. Uroleucon ambrosiae, whose siphunculi are less than 1.5 times the cauda, which is pale). The cauda bears 13 - 21 hairs. The body length of adult Uroleucon rurale apterae is 2.8-3.4 mm.

First image above copyright Peggyo, second image copyright Donna J. Parry,
both under a creative commons licence.

Alate Uroleucon rurale have a brownish-green head and thorax, the abdomen is grass-green, and the legs, siphunculi, cauda and antennae are blackish. Antennal segment III has 16-46 secondary rhinaria. The marginal sclerites are pale dusky to dusky, and located on abdominal segments II, III, and IV. The marginal and antesiphuncular sclerites bear large transparent tubercles. The siphunculi have slightly less than the apical third reticulated. The cauda bears 15 - 22 hairs.

Uroleucon rurale is monoecious holocyclic on various species of Verbesina, especially wingstem (Verbesina alternifolia). Sexuales are produced in fall, with alate males. The species has a northerly distribution, being found in the eastern USA from South Carolina northwards (cf. Uroleucon verbesinae, which is found in south-central and south-eastern USA).

 

Other aphids on the same host

Uroleucon rurale has been found on 3 Verbesina species (Verbesina alternifolia, Verbesina occidentalis, Verbesina virginica).

Acknowledgements

We are grateful to Peggyo & Donna J. Parry for making their images of Uroleucon rurale available for use under a creative commons licence.

We have used the species accounts given by Hottes & Frison (1931 ) (as Macrosiphum ruralis ) & Olive (1963) (as Dactynotus ruralis), 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

  • Hottes, F.C. & Frison, T.H. (1931). The Plant Lice, or Aphiidae, of Illinois. Illinois Natural History Survey Bulletin 19(3), 123-447. Full text

  • Olive, A.T. (1963). The genus Dactynotus Rafinesque in North Carolina (Homoptera: Aphidae). Miscellaneous Publications of the Entomological Society of America 4, 31-66.