If crown and roots are badly infected, plants may not recover, but the drier conditions will favor recovery of many plants. This is the most common disease for which fungicide resistance is a problem. Golf courses should be using a fungicide rotation to avoid this problem. Dollar spot mycelium will disappear immediately when touched.
Fairy ring is the only cause of extra greening at the leading edge of areas.
Brown rings alone can have other causes. If you choose to apply a fungicide for fairy ring, keep in mind that the mycelium is in the soil and may be hydrophobic. Spiking or aeration followed by watering in of the fungicide is necessary. The disease begins as small reddish spots. Junction is labelled for disease control and contains copper hydroxide which may help protect plants or prevent spread by foot traffic.