Black spots in Lawn Cork Ireland

Would appreciate help with lawn black spots in attached photo. My lawn
is 30 years old. Black spots started to appear about 6 years ago in one
corner of lawn. Now they have spread all over the lawn. The blackness
does not seem to be growing on the soil. It seems to be attached to
grass stems & leaves. It is a matted thing, with spongy appearance, &
slightly slimy/sticky. It is worse in wet weather.
About 3 years ago I put white lime on the blackness. It cured it for a
while, but it came back again. March 2012 I sprayed bluestone on moss
patches, & scarified the lawn a few weeks later in dry weather. The
blackness is not dead moss.
The lawn is not low-lying. It is not boggy. It is on good soil. It has a
nice slope for water run-off. It does not show pools of water.
Any ideas on a cure. Any danger it will eventually kill the grass.
|Filename: Lawn problem July 2012 006.JPG |
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Most black / smutty things like this is fungus. I have something more smutty here in America. I used GarlicGP. Which you can make your own garlic and spray. During the summer months, after it rains or if I water. I have to spray it down else the fungus hits me. With fungus you have to spray all the time. I even removed a foot of top layer of dirt in the front. Fungus still there. Baking Soda also good for fungus control. Its the spores that are tough to kill, if you really can.
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