No, you won't spread it. Aerate the whole lawn at least once
if you're paying for a rental.
The rings won't change much from your aeration job, but the whole
lawn will thank you for it.
The rings will subside a bit when the weather cools off, don't be
fooled into thinking the aeration helped.
btw...we don't aerate untill Septemer, here in Ohio.
Fairy rings are formed from fungal mycellial webs (underground) which are
breaking down something under the ground. You could lift the affected lawn
sodding (including several feet in front of the spreading ring) and remove
the debris. Or, you could just let the ring run its course. Unless the
lawn above it is dying (then it's probably brown spot -- treat with a
fungicide), don't worry about it. It won't hurt anything.
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