Not sure if "heat tracks" is the most common term. You probably know what I mean, especially if you mow grass, (I don't). What words do you use. What causes it? Anybody have good pictures? It comes (i think) from mowing or running equipment with tires on dry or heat stressed or wilted turf. It looks fine until 24 hours later, then the tire tracks turn brown--sometimes the footprints, too. Looks like you had Roundup on your tires. I had a situation like this with my Permagreen. Almost every single tire track turned brown. Except when the grass was in the shade on the north side of the house. I asked a university professor about this last week. Baffled. He didn't seem to know anything about it. Any suggestions on what to tell the customer? How to prevent? How to predict "heat tracks"?