I've got aprox. I mile of hedge row full of large old knarly cherry tree's. They are mixed with locust & poplar & birch. Many of the cherry's are dying showing dead limbs along with the good ones. Most are in the 2-3 ft diameter at the base and are 40-50 ft tall (by eye). I cut a couple down to use them for fire wood and clean the dead wood out of my hedge rows. ALL the cherry's I cut down had the center eaten out for the first 4-5ft of tree by these big black ants. These ants didn't apear to attack the other tree's in the hedgerow...just the cherry's. (The rest of the tree both dead and alive were solid and will make good firewood.) Question is...can I save some of those other big old cherry's? Any way to cut down on that ant population on the rest of the hedgrow? Thanks again for you advice.