Dollar Spot disease is caused by the fungus Clarireedia jacksonii and can affect warm and cool-season grasses. Dollar Spot is easily confused with Brown Patch. However, the brown spots caused by Dollar Spot are usually smaller in diameter, measuring anywhere from the size of a silver dollar to the size of your hand. Dollar spot is usually associated with lawns that are low on nutrients and suffering from drought. A proper fertilization program can help prevent the development of this disease. Dollar Spot is most prevalent in the spring and fall. However, this fungus can survive over winter and reoccur.