Both golf course's tees and fairways were treated with a plant growth regulator this week. Applying growth regulators in the summer time helps to reduce mowing frequency. Theoretically, this could reduce mower wear and tear, reduce fuel consumption, and minimize excessive clippings.
Coincidentally, this was a perfect timed application considering the potential weather event next week and the possibility of not being able to mow for a few days.
On a side note, if you ever see the little white foam dots on the fairways, these are markers to let the operator know where they have already sprayed.