Got a Bardsey island apple tree recently, about 6ft in a pot, soon to be planted out, but has started to show yellowing on the leaves, please see pictures! its still mainly green but there is maybe 10% yellow/ yellowing leaves on the tree.
I have googled a bit but can't quite decide what it might be from the descriptions, it is next to an olive tree that appears to have 'peacock spots' .
what is wrong with the apple tree? and whats the best solution?