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.
What's Pale Mark doing underneath the Acer leaves?
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
Knowledge is knowing that a tomato is a fruit.
Wisdom is not putting it in a fruit salad.