Dollar spot on turfgrass is a foliage disease caused by the fungus Sclerotinia homoeocarpa. Symptoms appear on individual leaves as light-tan-colored lesions on the tips or laterally across the middle of the blade. Lesions are surrounded by dark-brown borders. Multiple infected leaves merge together to form a circular, straw-colored, silver dollar-sized patch in the turfgrass. The patch may exhibit white, cottony fungal mycelium in the morning when dew is present. Dollar spot is typically observed in the spring and fall and commonly affects bermudagrass and seashore paspalum.
Aerial mycelium associated with dollar spot in bermudagrass (Courtesy A.Martinez)
Dollar spot lesions on bermudagrass (Courtesy A. Martinez)
One way to reduce disease incidence and accelerate turfgrass recovery is to maintain a healthy lawn through balanced fertilization and irrigation and regular mowing. Follow these simple guidelines:
In addition to cultural practices, fungicide applications may be required to achieve effective disease control. Always check fungicides labels for site application restrictions. When selecting products, homeowners must purchase fungicides that are labelled and recommended for residential lawns. When using fungicides, always remember to follow the label rates and frequency of application.
Fungicides used to manage dollar spot are sold under various trade names. They contain these active ingredients.
|Fungicide Active Ingredients|
For information on sample collection and submission guidelines please visit the Plant Diagnostic Center.
Download here: Louisiana Home Lawn Series: Dollar Spot 3624-V