A pale to dark green aphid found on spruce (Picea) or silver fir (Abies) needles, usually Sitka Spruce (Picea sitchensis).  See Infuential Points (link below) for a description.   It sometimes causes defoliation and can be a serious pest of Sitka Spruce plantations.

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Spruce or silver fir trees

Unusually, both apterae and nymphs continue to be active through the winter.

see Influental Points page for Elatobium abietinum