Dollar Spot Fungus: A Common Turfgrass Disease

Turfgrass is an essential part of landscapes and recreational facilities, providing a well-manicured and appealing visual environment. However, maintaining healthy turfgrass can be a challenging task due to various factors such as environmental conditions and diseases. One of the most common diseases that affect turfgrass is the Dollar Spot Fungus.

What is the Dollar Spot Fungus?

The Dollar Spot Fungus (Sclerotinia homoeocarpa) is a fungal disease that affects turfgrass, particularly golf courses, lawns, and other sports fields. The fungus gets its name from the small, circular spots it creates on the grass blades that resemble silver dollars. These lesions or spots are usually between 1-4 inches in diameter and have a straw-colored appearance.

This disease is caused by a fungus that thrives in moist environments with temperatures ranging from 60-85°F. Hence, it is prevalent during the late spring and early summer months when humidity levels are high. Additionally, the fungus can survive through winter and reemerge during the warmer months.

Signs and Symptoms

One of the most visible signs of Dollar Spot Fungus is the presence of small, tan-colored lesions or spots on the grass blades. These spots later turn into white lesions with reddish-brown borders resembling a "smoke ring." As the disease progresses, these spots expand and join with each other, forming larger patches, which can lead to significant damage to the turfgrass if not addressed promptly.

Furthermore, Dollar Spot Fungus also causes the grass blades to become weak and fragile, making them prone to breakage. This weakness can lead to brown patches, thinning of the turf, and even death if not treated timely.

Prevention and Control

Preventing and controlling the spread of the Dollar Spot Fungus requires consistent maintenance practices and proper cultural management. Here are some preventive measures:

• Aerate the soil regularly to improve air circulation and water drainage.
• Maintain appropriate watering schedules, especially during warm and humid weather conditions.
• Provide adequate fertilization to ensure the turf is healthy and strong enough to withstand the disease.
• Mow the lawn regularly at the appropriate height to avoid overgrowth and to promote better air circulation around the turfgrass.
• Clean and disinfect all gardening tools regularly, especially after use in an infected area.

Using fungicides can also reduce the spread of the disease, but this should be done under the guidance of a professional turf manager or a licensed pesticide applicator. Additionally, using biological controls such as Bacillus subtilis, a bacteria that kills the fungus, can also help prevent the spread of the disease.

The Dollar Spot Fungus is a common disease that affects turfgrass and can cause significant damage if not controlled promptly. Consistent maintenance practices and proper cultural management are key to preventing and controlling the spread of the disease. By following the preventive measures mentioned above and seeking professional advice, you can keep your turfgrass healthy and free from the Dollar Spot Fungus.

Dollar Spot Fungus on turfgrass

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