My first few weeks going to meetings I saw this tool sitting next to a person. I asked him what it was, and he said it was a root hook to straighten the roots......
Said tool looked suspiciously like a horse hoof pick to me, with a higher price tag! Go to any feed store and for a few dollars get a hoof pick-they even come in "ergonomic" versions. If it can stand up to a horses' hooves, it can stand up to roots. You can even get the folding versions!
And of course, root rakes- bend the tines of a fork over and viola! Root rake!