my lawn in the UK (Yorkshire) has been attacked by Fusarium which is a fungal disease, The grass turns brown I in patches, which some days later turn pale green and is mosslike, Advice please, Alan Squires
I can direct you to two sites with information about the cause and treatment of fusarium blight:
The best control is prevention since chemicals are generally restricted to lawn care professionals. Try incorporating the cultural controls first to prevent further spread and re-occurrence. If the problems persists you may need to call in a professional.