[green fingers]

I have a dual fruit apple tree at my allotment.
Last year I had apples from both the eater and cooking apples.
This year  only  two fruits have set.
On some of the leaves are red spots (which I presume is spider mite) and have treated the tree with an organic mite killer.
Now some of the new leaf tips seem to be curling.
Has anyone any ideas on what is happening.
My pear tree is having similar problems?

[Yorkie]

Curling can often be the sign of pest damage - have you uncurled the leaves to see if you have aphids underneath for example?

[green fingers]

Thanks a lot.  I will check under the leaves (when it stops raining) but I suppose I have been concentrating on the red spider mite(?). 

[snow white]

Lots of aphids on my trees atm.