Solved Apricot plant - disease?

Hi all,
This is my small (approx 20cm) apricot plant that I started from seed (just for fun ).
It is 3 and a half months old.
I've noticed it's started to get this silvery powder-like substance on some of it's leaves which concerns me.
Should I cut those leaves off?
Also do I need to 'top' the plant and prune the top off?

Many thanks for any advice at all in advance.

 

I wouldn't 'top it' Momo,I'm sure it will be fine,maybe needs a bit of air circulation,if you can keep it in a porch or Greenhouse for the winter it hopefully should be fine.

 

Looks like powdery mildew, the leaves will be falling soon so I'd not worry too much about it.
Last picture looks a bit like some kind of infestation on one of the stems.

Are you growing it as a house plant?

Its basically a hardy tree.

 

Thanks all.
I won't cut any leaves off.
Yes I was growing it indoors.. should I move it outside? Or is it too late to try hardening it now?
(I am in the UK)

 

Well should be ok to put outside now in a sheltered position, maybe near the house and away from too much rain,the leaves will soon fall and nothing will happen until next spring.

 

Seen as it's just a babby I'd have it in a porch or GH anywhere not heated but sheltered.