Well, I'm definitely not an expert but I did a quick google search on the problem and found a reference at www.whatsthatbug.com about beetles. This is a great site, but could take you a while to peruse all their postings, ID your bug, and find a solution - if you don't you can alway ask them. I found some pictures of the beetle grub and it is a milky-white fat wormy looking thing. I would look for information about 'borer beetles' and 'tiger beetles' in relation to your maple. The grubs (baby beetles) seem to be what damages the trees boring into them. I did not come across a solution to your problem though. I found this particular post which seemed relevant:
Hi Ian,
Your beetle, the Asian Longhorned Borer, Anoplophora glabripennis, is a new exotic introduction to the U.S. and it is causing quite a bit of commotion. The U.S. Department of Agriculture site states: ' This beetle is a serious pest in China where it kills hardwood trees in roadside plantings, shelterbelts, and plantations. In the United States the beetle prefers maple species ( Acer spp.), including boxelder, Norway, red, silver, and sugar maples . Other known hosts are alders, birches, elms, horsechestnut, poplars, and willows . A complete list of host trees in the United States has not been determined. Currently, the only effective means to eliminate ALB is to remove infested trees and destroy them by chipping or burning. To prevent further spread of the insect, quarantines are established to avoid transporting infested trees and branches from the area. Early detection of infestations and rapid treatment response are crucial to successful eradication of the beetle. ' According to another government site, the English translations from Asian languages for this beetle's name include Starry Night Sky Beetle and Sky Ox Beetle.
Good luck,
Sherri

Here is a link that might be useful: What's That Bug