It's important to note that red thread is a cosmetic disease which does not affect the grass plant at the crown or root-zone levels. In other words, turf will return to its normal state once conditions become less favorable for the disease, and more in favor of turfgrass growth.
Fertilize the affected area of the lawn with an organic-based fertilizer. This will help the lawn area "outgrow" the condition by producing new leaf tissue.
If needed, watering should be on a weekly basis, soaking the areas for approximately one hour. Allowing the turf to dry out excessively can be very damaging and should be avoided.
The red thread disease overwinters in thatch so if there is a significant thatch layer in your yard dethatching can help to reduce future outbreaks. For lawns with an appropriate amount of thatch, a regular schedule of core aeration is recommended to minimize future outbreaks of the disease.
Seeding the lawn with turfgrass varieties resistant to disease is also an excellent cultural control.