Eggs
Shiny black, and found on the bark of apple trees, mainly on older wood.
Visual distinction between the eggs of different aphid species is impossible.
Adults
Pink to dark bluish grey, with a mealy powdering of white wax.
Other pests with which the rosy apple aphid may be confused
Rosy leaf curling aphid
Very similar in appearance to the rosy apple aphid, but damaged shoots turn a distinct bright red colour.
Pear bedstraw aphid
Only occurs on pear and not on apple. Rosy apple aphid does not occur on pear.