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Pale Mark's underneath Acer leaves

I have noticed pale marks undeath leaves of Acer tree which is in a tub. 
Im wondering what they may be. Any ideas what is causing them/is it how the tree is?
The leaves are curling and falling off the tree.


  • Hostafan1Hostafan1 Posts: 34,735
    What's Pale Mark doing underneath the Acer leaves? ;)
  • Pete.8Pete.8 Posts: 11,135
    It's not easy to see from the pic what the spots are but one possibility is Scale Insect.
    It's this time of year they nymphs hatch and take up residence - BUT, that's just a guess

    Some RHS info here may help you determine if it is

    Billericay - Essex

    Knowledge is knowing that a tomato is a fruit.
    Wisdom is not putting it in a fruit salad.
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