I have about an acre that has a lot of 2" oak and Sweetgum trees as well as a LOT of 1-2 inch wild pear trees. What is the best way to clean this up. I tried chemicals on the wild pear saplings but they always seem to come back. I would like to take care of this problem so that I don't have regrowth. I have a 3930 new holland and a Gannon blade. I seem to recall there is some type of grabber that you can get to pull up the saplings but this seem like it would take a long time. Thanks