One common fungus affecting lawns in New Jersey is Dollar Spot. It appears as circular, somewhat sunken brown spots about the size of a silver dollar. Infected areas of 4 inches or larger may run together, creating bigger patches.
Dollar spot will usually grow out even with correct watering and fertilizer. sometimes, a fungicide may be necessary to stop the disease from spreading. Dollar spot can be found from late spring through early fall especially in turf stressed by drought, soil compaction and/or thatch build up.