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Yellow-legged knapweed aphidOn this page: Identification & Distribution Other aphids on the same host
Identification & Distribution:
Apterae of Uroleucon jaceicola are dark bronze-brown. They have strong body hairs, pointed and placed on rather large scleroites. Their coxae are dark, but the legs are yellow apart from black knees and black apices to the tibiae (cf. Uroleucon jaceae which has wholly dark tibiae). The siphunculi of Uroleucon jaceicola are black, although they may be paler in summer than in spring. The siphunculi are 2.0-3.0 times the length of the cauda. The cauda is pale yellow with a dusky tip, and bears 9-18 hairs (cf. Uroleucon jaceae which has a black cauda). The body length of Uroleucon jaceicola apterae is 2.9-3.3 mm.
The alate Uroleucon jaceicola has several clear abdominal marginal sclerites and long thin siphunculi.
Uroleucon jaceicola lives on the stems of common knapweed (Centaurea nigra). In spring the yellow-legged knapweed aphid is found mainly low on stem, but moves to the upper parts later on. Oviparae and very dark apterous males of Uroleucon jaceicola have been found on the petioles of radical leaves in October. Uroleucon jaceicola is found in Europe, west Siberia and Central Asia.
Other aphids on same host:
Uroleucon jaceicola has been recorded from 10 Centaurea species.