Fairways were sprayed earlier this spring to stop Poa annua from going to seed, this control product also slows growth and creates a bronzing look to the fairways. This off color will last two to three weeks and eventually turn back to normal green. Bronzing is only a side affect and doesn't harm the grass. Again the reason for spraying fairways is to eliminate the formation of poa seed heads and increase a better root system in the grass plant. No seed heads will result in better playing conditions.
Another major color difference in the grass is where new bluegrass rough sod has been laid next to existing poa/ bent rough. This color change will continue until all renovation work is completed on the course. Bronzing of fairways accentuates everything.
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