Talkback: Nail gall

I don't have any lime trees so I don't have this problem (yet). I have been looking at buying lime trees this Summer tho'. I saw this article and thought how strange it looked, not sure if it's put me off or not. I'll have to give it another thought.

..Hi..I am learning to draw plants, flowers and trees...! I took some leaves from a tree near to where I live - I think its a Lime! Leaves
had waxy growths on stems..I opened one to find pale blue, tiny egg -like larva? moving around inside!! What are they??
Thanks, Lise