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Can anyone name these aphids please?

Observed: 26th August 2013 By: The UncertainThe Uncertain’s reputation in InvertebratesThe Uncertain’s reputation in InvertebratesThe Uncertain’s reputation in Invertebrates
Brown aphids on crack willow
Description:

Brown aphids with reddish legs, crowded along stem of crack willow - sorry, it's not a very good picture

Identifications
Species interactions

No interactions present.