Jim,
I'm a little late here, but that looks like classic "Brown Patch". More
info here:
http://www.american-lawns.com/problems/diseases/brown_patch.html
I hadn't heard about the corn meal treatment but I may suggest it to my
neighbor who has a bad case of it in his backyard this year.
Charlie
On Sun, Aug 16, 2009 at 1:52 PM, Jim Nichols <jhnichols@xxxxxxxxxxxxx>wrote:
> I know there are many knowledgable people on these two lists. I am looking
> for a hint on the cause of a circle of dead grass that is very well defined
> on my lawn and extends, faintly, into the adjoining lawn.
>
> I recall that a cherry tree once existed in this general area in the
> neighboring lawn. I had a maple in my yard that was damaged by a wind storm
> and removed. However, neither of these was near the center of the circle.
> I have heard that maple roots can cause problems in grass, but no
> previously-existing root circle matches what I now observe.
>
> Anyone got a suggestion?
>
> http://gallery.leica-users.org/v/OldNick/Lawn+Circle.jpg.html
>
> Jim Nichols
> Tullahoma, TN USA
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