tonyk1 wrote:
The upper branches of my Acer have failed to produce any leaves this
year after growing really well for years. The lower part of the tree is
fine any suggestions

My guess is that it's been 'caught' by wind or perhaps, frost. Acers
loathe to be in windy spots and the finer the leaves the worse that
problem is. They hate to be over-watered, too, so don't be tempted,
will you?! If it's in a pot, move it to a less windy area, a sheltered
one, in fact.
--
Sacha
www.hillhousenursery.co.uk
South Devon