Tordon IS a woody vegetation killer (trees, brush, multiflora rose). DO NOT use Tordon to control anything else as it has the potential to translocate to the roots of non-target woody vegetation.
Tordon 22K IS a broadleaf weed killer and is listed to control several thistles.
Why they used...
In 65 & 66 I lived on 30th st, across from the old North infield gate. Went to school 61 about a block east, no air conditioning, so the windows were open. I remember a lot of daydreaming during the "30 days of May", listening to those cars zooming around the track.
There were times that I did not like my job, but I stayed with it for 36 years. I learned and moved into different positions over the years and enjoyed the challenges. Now I have the best job in the world...RETIREMENT, and I love it.