Pest on apple tree?

I was doing my rounds this morning and noticed something on my apple tree. Should I be worried?

I'm still very new at this. This is a Granny Smith apple tree that I've had in the ground for 3 months.

Thank you

Look like wooly aphid (the silkies of the aphid world!) Given time, they WILL take out your tree from the roots. Some apples are more susceptible than others, so check if you have a susceptible rootstock that risks the tree life more.

Many controls will work: ladybug, lacewing, wasps, birds, soap spray... tweezers!

I couldn't say for sure, but here is a site that's proven to be quite valuable to me... Hope it helps you out.

http://bugguide.net/node/view/15740

Deinately wooly aphid. Try attracting some of those predators mentioned above.

Hoverflies go crazy for saint johns wort when its flowering