No need to spray, they will be gone in a few days. No need for warning unless you plan to eat them
once.
A fairy ring, also known as fairy circle, elf circle, elf ring[1] or pixie ring, is a naturally occurring ring or arc of mushrooms. The rings may grow to over 10 metres (33 ft) in diameter, and they become stable over time as the fungus grows and seeks food underground. They are found mainly in forested areas, but also appear in grasslands or rangelands. Fairy rings are detectable by sporocarps in rings or arcs, as well as by a necrotic zone (dead grass), or a ring of dark green grass. A fungus, mycelium, is likely to be present in the ring or arc underneath.
Info here: Fairy ring - Wikipedia, the free encyclopedia