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March is a critical time for lawn care as the weather begins to warm, and grass starts to grow actively. One common problem that lawn owners face during this period is Dollar Spot disease, which can cause unsightly patches and weaken the turf. Recognizing and managing this disease early can help maintain a healthy, lush lawn throughout the season.
What is Dollar Spot Disease?
Dollar Spot is a fungal disease caused by the pathogen Sclerotinia homoeocarpa. It appears as small, round, sunken spots on the grass blades, typically about the size of a silver dollar—hence the name. The disease is most active during warm, humid, or dewy conditions, which are common in early spring.
How to Identify Dollar Spot in March
Early detection is key to controlling Dollar Spot. Look for the following signs:
- Small, circular patches of straw-colored grass
- Thinning areas with a distinct, irregular shape
- White or tan-colored halos around the spots
- Grass blades with a bleached or bleached appearance
- Presence of a cottony or fuzzy mycelium on affected blades during humid conditions
Factors that Promote Dollar Spot
Several environmental and cultural factors can increase the risk of Dollar Spot disease:
- High humidity and frequent dew formation
- Warm temperatures between 60°F and 75°F (15°C – 24°C)
- Overwatering or poor drainage
- Low nitrogen levels in the soil
- Compacted soil and poor air circulation
Preventing Dollar Spot in March Lawns
Prevention is more effective than treatment. Implement these practices to reduce the risk:
- Maintain proper mowing height—generally 2.5 to 3 inches for most grasses
- Aerate the lawn to improve soil aeration and drainage
- Apply a balanced fertilizer with adequate nitrogen levels
- Water early in the morning to allow grass to dry during the day
- Reduce thatch buildup and remove clippings regularly
Controlling Dollar Spot Disease
If Dollar Spot appears despite preventive measures, consider the following control methods:
- Apply fungicides specifically formulated for turfgrass diseases, following label instructions
- Use a fungicide with active ingredients like propiconazole, azoxystrobin, or myclobutanil
- Increase mowing height temporarily to reduce stress on the grass
- Limit irrigation to avoid excessive moisture and dew formation
- Remove and dispose of infected grass clippings to prevent spread
Timing and Monitoring
Monitoring your lawn regularly during March is essential. Apply fungicides preventively if conditions favor disease development, especially when warm, humid weather persists. Always follow the manufacturer’s instructions for application rates and timing.
Conclusion
Early detection and proper management are vital in controlling Dollar Spot disease in March lawns. By maintaining healthy turf through cultural practices and timely fungicide applications, you can keep your lawn vibrant and free from unsightly patches throughout the growing season.