After applying plant-regulating materials on a golf course, where must the marker be placed?

• A. Near the practice range
• B. Near the 18th green
• C. At the clubhouse entrance
• D. On the number-one and number-ten tees

Answer: (D)

The key idea is that markers for plant-regulating materials must be placed where golfers are about to start play so everyone on the course is aware of the recent application. Putting the marker on the number-one and number-ten tees ensures visibility to players regardless of which end of the course they begin from, covering both directions of play. Placing markers near the practice range, at the clubhouse entrance, or only at the 18th green would not reliably alert players who are about to tee off on the course’s different ends or who are just starting their round, so those locations don’t effectively communicate the treatment information.