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Hardiness Zone: 6a
Marianne from Trenton, OH
The symptoms you're describing sound like Brown Spot (also called Brown Patch), a fungus afflicting Bermuda Grass, Kentucky Bluegrass, tall Fescue, Perennial Ryegrass, and Creeping Bentgrass. It often occurs in areas with high humidity or in lawns growing in heavy shade. Brown Patch is characterized by a small round or horseshoe-shaped brown spot, which eventually grows and spreads to a few feet wide. It's common for the inner portions of the spot to green up (recover), while the outer edges of the spot stay brown. To prevent Brown Patch, aerate the soil in affected area, and if necessary try to increase the amount of sun exposure the areas receives. Avoid using excessive amounts of nitrogen fertilizer.
Another (fungus) possibility is a Dollar Spot. Dollar Spot is common to Kentucky, Bluegrass, Bent Grass and Bermuda in humid climates. They are characterized by small, silver dollar-like circles (up to the size of a grapefruit), that are brown or straw-colored in appearance. This fungus is most commonly seen during warm, wet weather and on lawns lacking in nitrogen. To prevent Dollar Spot, water only as needed and in the morning hours so that grass has plenty of time to dry before nightfall. Keep your lawn well aerated, remove dead thatch and avoid excessive amounts of nitrogen fertilizers-especially in the spring and fall.
Good cultural practices go along way to preventing these diseases. Your local garden center can also recommend fungicides that are appropriate for both of these diseases, but they are expensive and are also only recommended as preventative measures.
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By Karen in SC
Same thing happened to us when we built our house. Come to find out it is where the painters dumped their paint buckets. We took a soil sample to the county and they tested it for us.
Everybody has great answers. Geepers, our lawn does it where the septic tank clean out lid is.
I had a large tree cut down three years ago. I've replanted the spot with grass seed in September every year since. The grass looks great until June when the spot turns brown. The lawn receives a lot of direct sun light. The rest of the lawn looks great and I've used the same seed in other areas of the lawn.
By Lionel J.
Add soil and manure to even out the mulch. It will speed up your process. I have 4 trees that were cut down and the sawdust left. My Ace gardener/hardware man who owns the place said this would work.
Why are there brown patches in my new lawn?
Hardiness Zone: 11
By CLARK from Yakima, WA
Many things can cause it, did you fertilize recently? Could be burns from too much fertilizer, also if you didn't water properly, that can cause it.