Dollar Spot is a prevalent turfgrass disease that many Minnesota homeowners and golf course managers need to be vigilant about, especially during the warm, humid months of summer. This fungal disease, caused by the pathogen *Sclerotinia homoeocarpa*, manifests itself through distinct symptoms that can severely impact the health and appearance of lawns and golf greens. Identifying the early signs of Dollar Spot is crucial for effective management. Typically, affected areas present as small, round patches that are initially tan or light brown, developing into larger patches over time. These patches can range from the size of a silver dollar—hence the name—to several inches in diameter, often surrounded by a darker green halo of grass that remains unaffected.
In Minnesota, conditions such as high humidity, warm temperatures, and poor soil moisture can exacerbate the occurrence of Dollar Spot. Homeowners and turf managers should look for signs during the peak season, typically from June to September. Besides the characteristic patchy appearance, another telltale indication is the presence of white, cobweb-like mycelium on the turf, particularly in early morning or late evening when dew is present. If these signs are caught early, preventative measures such as proper watering techniques, appropriate mowing heights, and fungicide applications can help curb the spread of Dollar Spot and maintain a lush, healthy lawn throughout the growing season. Regular monitoring and prompt action are key to managing this pervasive turf disease and ensuring the vitality of Minnesota's vibrant greenspaces.
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