There is an old - about 50yrs - white poplar tree in the front yard that has presented with a rather severe invasive root problem. In the past I have removed - cut out - the bigger root clusters but I'm not sure if this will harm the tree in the long run. I am seeking a solution - short of removing the tree - to this problem. All feedback is appreciated. If I did it right there should be images attached / inserted that show the extent of the problem.