I'm just wondering if any of you have experienced this. I'm not talking about the thinning of grass in areas where tires track the same place every mowing, such as on the side of a ditch. I have an account where the yard sits below the level of the street. I usually mow in one of three patterns. This year, I've mowed mostly diagonally, switching directions each mowing, because I like the diamond pattern it produces, and shows off well from the street. Last week, I decided to switch it up and mow parallel to the street. The last time I did this was probably 6 weeks or so ago. Anyhow, today when I serviced the account, in portions of the yard, the grass was totally brown in sections of last week's tire tracks. I'm not talking just a little dead on top, I mean totally brown! It isn't 100% coverage, seems kind of hit and miss. There are, however, some places where the strips of dead grass are perhaps 10 feet long. It looks exactly as if someone had precisely sprayed a strip with Roundup. I've never seen this before, but I've only been mowing commercially 3 years. This is the only yard I noticed this phenomonen on. However, I mow a couple of agriculture related businesses about 2 miles from this property. They are always driving across the property with trucks and trailers. About 3 or 4 weeks ago, there were some strips exactly like this where a truck or some other vehicle had driven across the grass. In this case, it was probably 50 yards long, again looking exactly like it had been sprayed with a herbicide. We've got a couple of good rains since then, and the grass has since greened back up in those tracks. I'm just hoping it also does so in my customer's yard. Anyhow, I'd just be interested in knowing if this is common, or not. Thanks.