Thanks for all the adivce on my previous post, but I have noticed some other things about my lawn, aside from the brown patches.- There are circles of brown, almost like someone sprayed brown paint to make a circle.
- I have noticed a grey, powdery substance on a lot of the blades of my grass.
- Also, could grubs have the effect of killing my grass, and therefore would some Ortho Grub Killer granuals help at all?
Sorry to keep asking, but I used to have the best looking lawn in my neighborhood, and it seems like it is dying a slow death. Any help is appreciated! 
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Printer-friendly view of this garden