I have a small dwarf peach tree I planted last year. So far so good.

Though the tree is only a few feet tall it is producing a lot of fruit (which I plan to remove for the year so the nutrients can go to tree and root system).

 My question is in regards to the picture I've attached. I have these small semi-circle bumps on the base of the larger leaves. I've also noticed that new leaves are yellowing and falling off the tree. I didn't have these bumps on the tree leaves last year. I'm guessing some sort of pest is laying eggs at the base of the leaf; though I really don't have much experience with this.

 Any information regarding this would be awesome.

 Thank you for your time, Shaun Legacy