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Old 07-28-2019, 05:05 PM   #1
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Spots in lawn


Hi
How do I fix these yellow patches / circles on the lawn? Are they from insects?
Thanks.
Spots in lawn-img_9302.jpgSpots in lawn-img_9303.jpg


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Old 07-28-2019, 05:19 PM   #2
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Re: Spots in lawn


Round or crescent shaped patches, sometimes with green in center --- sure sounds like "summer patch". Google it.
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Old 08-06-2019, 07:46 AM   #3
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Re: Spots in lawn


It may be not only because of insects, but there are also a lot of possible reasons:


- lack of water
- leftovers of old grass
- not enough light or minerals important for grass
- rare aeration
- freezing out in winter
- chemicals

Just think about all the aspects and decide which problem you lawn can relate to and solve them. remember that there are 3 things you should do to keep the grass healthy: aeration, scarification and mulching.
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Old 08-07-2019, 01:33 AM   #4
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Re: Spots in lawn


Not enough information. Do you have dogs? Do you water? If so, how much and how often? Do you fertilize? If so, what product(s) and what schedule?....
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Old 08-08-2019, 10:13 AM   #5
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Re: Spots in lawn


That is brown patch disease. It is a fungal infection frequently caused by improper watering schedule, fertilization (timing), or soil drainage.

Communicate more info and I can probably tell you what is going on......
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Old 08-08-2019, 01:48 PM   #6
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Re: Spots in lawn


@007noob , as the others have noted, it could be a number of different things.

If you have a dog, especially a big it will make patches when pees and poops.

If not, you might have a fungus that attacks the grass blades. Established grass plants will often recover from fungus if treated with a fungicide. Newly-seeded grass often dies and has to be re-seeded.

So, give us some more information.
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Old 08-08-2019, 04:12 PM   #7
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Re: Spots in lawn


I had similar, perhaps not as large, patches when I first got my riding lawnmower.

Turns out if you park it in one spot with the engine running, the exhaust burns the grass below it.

I told this story to a guy who was complaining about his "grub" problem. Turns out he had recently bought a riding mower. Yup. That was it.
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Old 08-09-2019, 09:54 AM   #8
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Spots in lawn


Thanks all for the replies.
I am thinking it may be a combination of fungus and grubs...
Fungus because in July the sprinkler was turning on at the evening time. From August I just manually turn on in the morning now. Also as others have suggested it looks like summer patch.

Iím pretty sure I have grubs as well because a couple of days ago I saw several small moth like butterflies come out as I walked across the lawn.
I did apply insect/grub control from homedepot but that was in early June.

I donít have little pup yet too pee and poop there but would like a playful Border Collie / mix sometime hopefully


Back to the grass... if I rake the yellow parts of the lawn the dead grass blades just come up... not the soil and roots.

Iíll apply ďBio advance grub killer plusĒ again. What could I apply for fungus? I have approx 5000 sq ft of lawn.
Many thanks again.

With all this stuff applied in the lawn would it be safe for a pet?

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Old 08-09-2019, 10:40 AM   #9
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Re: Spots in lawn


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Iím pretty sure I have grubs as well because a couple of days ago I saw several small moth like butterflies come out as I walked across the lawn.
A brown moth sounds like the adult stage of Sod Webworm. I think the adult stage of a white grub is going to look more like a flying beetle.
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Old 08-09-2019, 11:00 AM   #10
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Spots in lawn


Would the Bio advance grub killer take care of sod webworms as well or do I use something else?


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Old 08-09-2019, 11:06 AM   #11
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Re: Spots in lawn


Gotta read the label.
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Old 08-09-2019, 11:40 AM   #12
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Re: Spots in lawn


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Originally Posted by 007noob View Post
Would the Bio advance grub killer take care of sod webworms as well or do I use something else?


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Look for killers that contain things that kill on contact, like Sevin.

Some of the "natural killers" like Bacillus thuringiensis tend to be more victim specific, i.e., some work for caterpillars, others for beetle grubs.
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Old 08-09-2019, 11:44 AM   #13
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Re: Spots in lawn


@007noob , maybe do a thorough recon as they supposedly said in the military; look at various brown areas and test them, in particular by giving a gentle tug on the dead grass in more than one place. If the grass is well-rooted in, you usually have fungus; if it pops out without roots, it often means grubs, though sometimes grass can rot in the roots, too.

If you've seen Japanese beetles, those can give rise to grubs that can damage a lawn.

Moths that pop up out of the grass and fly off when you approach might or might not be sod webworms; that's only one of huge variety of moths. A better indication is if you see what look like little silky tunnels in the grass made by the caterpillars. Unlike beetle grubs, they won't be in the ground, and you'll able to see them. As can birds and parasitic wasps and flies, too.
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Old 08-09-2019, 03:41 PM   #14
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Re: Spots in lawn


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...As can birds and parasitic wasps and flies, too.
Not if you kill them all off by putting poison on your lawn.

Admittedly, I don't live in a neighborhood of finely manicured lawns, so I can get away with the occasional brown spot. I'm not suggesting anyone bring down the property values in their whole zip code. Just consider the risk/reward equation whenever you put chemicals on your lawn.

My approach is to let whatever grows naturally do it's thing. If it's green and can be mowed, that's fine with me. I tend to get different species of grass (and clover, etc.) settling into different areas of my lawn. Presumably the conditions are not the same everywhere, and some things prefer one area over another.

The things which grow naturally tend to be hardier species more tolerant of poor soil, drought, pests or whatever.
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