I cut back my Acer last year as it was too tall. The new leaves are now coming out and this morning I noticed that there was a sticky substance on some of the leaves........what is it and will it kill the tree which is much loved. Is there anything I can buy to stop this........thank you x
This sounds like Honeydews, which is the residue from pests.
You can treat the tree with Neem Oil.
These links have more information.