Something is eating my Acer

Help!!

My wife and I have been trying to grow an Acer for years but we keep failing miserably. We are now on our third in 5 years they keep dying off. The latest we brought about 3 months ago and its showing the same early signs the others did. The leaves are being eaten by something. I have looked all over the plant, its trunk and under the leaves and I cannot find any signs of bugs, eggs or larvae.

I've included a picture to see if anyone recognizes the problem from the leaf destruction.

 

Looks like Vine weevil..

http://www.acerforum.co.uk/yaf_postst4_Vine-Weevil.aspx

http://www.thegardenersalmanac.co.uk/Data/Acer/Acer.htm

 

Lucky you...Provado is still available in the UK! Or you could try the 'bio' route with nematodes, but they need very particular conditions to work effectively.