What Is Dollar Spot?
Dollar spot is a fungal lawn disease commonly found in cool-season grasses such as Kentucky bluegrass, perennial ryegrass, and fescue. The disease gets its name from the small circular spots it creates, often about the size of a silver dollar.
In the early stages, you may notice:
- Small tan or bleached patches throughout the lawn
- Grass blades with narrow, hourglass-shaped lesions
- Thin white fungal growth visible in the morning dew
- Multiple spots eventually merging into larger damaged areas
Dollar spot is most active during periods of high humidity, heavy morning dew, and inconsistent lawn care practices.
What Causes Dollar Spot?
Several environmental and cultural factors contribute to dollar spot development, including:
Low Nitrogen Levels
Lawns lacking proper nutrients are far more susceptible to fungal activity. Thin or stressed turf provides the perfect environment for dollar spot to spread.
Excess Moisture
Long periods of leaf wetness caused by humidity, overwatering, or nighttime irrigation create ideal conditions for fungal growth.
Compacted Soil and Poor Airflow
Lawns with heavy thatch buildup or compacted soil often retain excess moisture, increasing the likelihood of disease.
Improper Watering Practices
Frequent shallow watering can weaken the root system and encourage fungal development near the soil surface.
How to Treat Dollar Spot
The good news is that dollar spot can often be controlled with proper lawn care practices.
Water Deeply and Infrequently
Watering early in the morning allows the grass to dry throughout the day and reduces prolonged moisture on the blades.
Maintain Proper Fertilization
Balanced fertilization, especially adequate nitrogen, helps lawns recover and resist disease pressure.
Improve Airflow and Soil Health
Core aeration and dethatching can help relieve soil compaction and improve drainage.
Avoid Mowing Wet Grass
Mowing while the lawn is wet can spread fungal spores throughout the yard.
Apply Fungicide if Necessary
In severe cases, professional fungicide treatments may be recommended to stop the disease from spreading further.
Preventing Dollar Spot in the Future
The best defense against dollar spot is maintaining a healthy, actively growing lawn. Regular fertilization, proper watering habits, and routine lawn maintenance all play an important role in disease prevention.
A thick, healthy lawn not only looks better but is naturally more resistant to stress, fungus, and environmental damage.
Need Help Treating Dollar Spot?
If your lawn is showing signs of dollar spot or other turf diseases, professional diagnosis and treatment can help restore your lawn before the damage worsens. Early intervention is key to preventing larger problem areas and protecting the overall health of your turf.
