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Dollar spot is a common fungal disease that affects many lawns, especially during warm, humid summer months. August is a critical time to address this problem to prevent it from spreading and causing extensive damage to your grass. Proper treatment and maintenance can help keep your lawn healthy and vibrant.
Understanding Dollar Spot
Dollar spot is caused by the fungus Sclerotinia homoeocarpa. It appears as small, circular patches of tan or straw-colored grass, often with a thin, white filamentous growth on the surface. These patches can grow and merge, leading to larger areas of dead grass if not treated promptly.
Signs and Symptoms
Early signs include small, round patches that are about the size of a silver dollar. The grass in these patches may be wilted or bleached. As the disease progresses, these patches can expand, and the grass may become thin and patchy. You might also notice a cottony or fuzzy appearance on the blades during humid conditions.
Preventive Measures
- Maintain proper mowing height to reduce stress on the grass.
- Aerate your lawn to improve air circulation and reduce humidity.
- Water early in the morning to allow grass to dry before evening.
- Apply a balanced fertilizer to promote healthy growth.
- Remove thatch buildup to improve soil contact and reduce disease risk.
Effective Treatments in August
In August, targeted fungicide applications are essential to control dollar spot. Choose a fungicide labeled for dollar spot control and follow the manufacturer’s instructions carefully. Timing is crucial; applying fungicides preventatively before the disease fully develops can be highly effective.
Choosing the Right Fungicide
Look for fungicides containing active ingredients such as propiconazole, myclobutanil, or chlorothalonil. These are proven effective against dollar spot. Always read the label to ensure compatibility with your lawn type and existing treatments.
Application Tips
- Apply fungicides in the early morning or late afternoon to avoid rapid evaporation.
- Use a broadcast sprayer for even coverage across the affected areas.
- Repeat applications may be necessary, typically every 14-21 days, depending on the product and weather conditions.
- Combine fungicide treatments with cultural practices for best results.
Additional Tips for Lawn Care in August
- Maintain consistent watering schedules to prevent stress and reduce disease susceptibility.
- Keep lawnmower blades sharp to avoid tearing grass blades, which can promote disease.
- Remove lawn debris and thatch to improve airflow and reduce fungal growth.
- Monitor your lawn regularly for early signs of dollar spot or other diseases.
By combining cultural practices with timely fungicide treatments, you can effectively combat dollar spot and maintain a healthy, lush lawn throughout August and beyond. Vigilance and proper lawn care are your best defenses against this common fungal disease.