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Yellow-legged knapweed aphidIdentification & Distribution
Identification & Distribution:Apterae of Uroleucon jaceicola are dark bronze-brown. Body hairs are strong, 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 (compare with Uroleucon jaceae which has wholly dark tibiae).
Image of aptera: guest image copyright Nigel Gilligan, all rights reserved
Uroleucon jaceicola siphunculi are black, although they may be paler in summer than in spring. They are 2.0-3.0 times the length of the cauda. The cauda is pale and bears 9-18 hairs (cf. Uroleucon jaceae which has a black cauda). The body length of the aptera is 2.9-3.3 mm.
Uroleucon jaceicola lives on the stems of common knapweed (Centaurea nigra). In spring it 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.