[valr]

I have a tree called a populus candicans aurora (just spent ages on google trying to find out the name of it!  ).

It is a type of poplar with variegated cream, pink and green leaves. It was planted 2 years ago and is about 2.5m tall.

I noticed it wasn't looking very happy and some of the leaves were dead and brown and curling. Inspection revealed it is crawling with wee black beetly bug things! Yuk! 
What can this be and what can I do about it ?    Any advice would be appreciated

[little blue]

can you get a picture of the black beetley bug things?!
we had a huge infestation of "        "         "      "       on our big christmas tree, cant remember what they were though!  dont think they did real damage, just horrid to look at....