There are several trees in our yard which have horizontal lines of holes which are about one half inch apart. About one quarter inch diameter holes on the main trunks. One tree is dying from the top. I will try to send a photo. We have put aluminum foil and bell chimes in the trees to scare woodpeckers if that's what the culprit is. Help!
Denton County Texas
It does sound like woodpecker or sapsucker damage. It shouldn't kill the tree. Here is some information on woodpeckers: http://agrilife.org/txwildlifeservices/files/2011/07/Woodpeckers.pdf
Your tree may be dying, but I would suspect a different cause. Of course the woodpecker damage isn't helping it. The best thing you can do for your tree is to reduce its stress. I would recommend you water it differently than the rest of your yard. Trees like deep and infrequent watering. This will get the roots to grow down deep. Also, mulching around the tree will help eliminate stress, but make sure you don't put the mulch up against the trunk.
Here is some helpful information on watering trees:
Let me know if I can assist you further!