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Old 08-16-2011, 06:42 PM
 
15 posts, read 49,818 times
Reputation: 13

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Hello all,

Im a beginning level gardener/lawner? Im in Denver and i have a small lawn of kentucky bluegrass. I have gotten some pretty heinous looking dead spots in my lawn. The neighbors said they have had similar spots diagnosed as sod webworms and or grubs. I would think most likely that is what i have but i just want to make sure, as i have not had a professional examine my lawn. Im also considering the problem to be competition with some trees in the same areas, and fungus of some kind.
Here are 6 pictures to illustrate:
The first 3 are the front lawn but only in the street side section (no spots have been found in the house side section). This is the second time they have browned up and grown back. I thought maybe i let them get too dry. They were being water 3 times weekly for 25 minutes at night but i just change it to the morning because i read fungus thrives when you water at night. I have also applied a granuler bug killer within the last couple of days for sod webworms and grubs. The last three are the back yard this is new grass planted in march. Both yards have been fertilized in the past. There is a pretty big silver maple in the back (maybe 5-6 years old). We got nearly 2 weeks of raining every day so i turned off the sprinkler system and i dont think i turned it on soon enough after we dried out, thats what i think supports my "competition" theory.
My bug theory is from the neighbors...i have not seen any of these bugs.
And the fungus theory is my wild card...
I have no idea what is actually going on...any help wold be greatly appreciated.

Bill










Album of all these pics
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Old 08-16-2011, 07:24 PM
 
1,963 posts, read 4,257,142 times
Reputation: 1433
From what I was told about grubs is that your dead lawn literaly comes up when you just easily pull on it. If the root is still stuck in the ground pretty well then it is possibly not grubs.
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Old 08-16-2011, 08:38 PM
 
Location: Former LI'er Now a Rehoboth Beach Bunny
7,264 posts, read 9,640,546 times
Reputation: 6937
Looks like a portion of my lawn too and I have grubs!!! If you turn up a spade full of the grass where it is dying you can see small white "worms" that ball up when the air hits them, you have grubs.
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Old 08-17-2011, 08:16 AM
 
Location: Bourne, MA
30 posts, read 80,263 times
Reputation: 37
Looks like grubs! Ask your local nursery for Milky Spores, it works wonders. Some grubs in you yard are not harmful, if you take up a shovel full of dirt, and there are 1 or 2 grubs, that is normal, it's when you are finding more than that, that it is harmful, and I bet if you take a shovelful, that's what you will find. Take that shoveful to the nursery, they will help you, and it won't cost you anything.
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Old 08-17-2011, 09:12 AM
 
438 posts, read 1,465,300 times
Reputation: 431
Definitely looks like grubs. You need to put down grub control late summer like mid or end of July, you should do this every year because you never know when they will come and destroy your lawn. Like everyone said already, if you dig in the dead spots you will most likely find gross looking white worm type things that are shaped like C's about an inch long.
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