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

And why has the entire ask the lawn doctor forum been locked?
http://forums.gardenweb.com/forums/yarddoctor/#post

Because this sounds exactly whats happened to my lawn but the forum is locked and they never got an answer:
http://forums.gardenweb.com/forums/load/yarddoctor/msg0612555211833.ht ml

http://ohioline.osu.edu/hyg-fact/2000/2011.html

Watering 3x per week was 2x too often. That frequency does not allow the soil surface to dry out enough. Fungal disease is one of the problems that comes from too frequent watering. Try watering once a week for an hour.

I didn't even know there was a garden doctor forum, but it is locked. One thing you can be assured of is you cannot know what goes on behind the administrative doors of this website. I've seen people get banned for no apparent reason and with no explanation.

That means that a lot of the "rules" don't really apply.

It's at a high altitude and is semi-arid.

Watering at night is not only not a problem, it is probably the best time to water, especially if it's late night to early morning. There's generally less wind and less water is lost to evaporation. As a result, more water makes it into the soil.

Watering once a week is a good goal, but probably not one that is likely to result in a green lawn. So much is lost to evaporation that even if you water deeply, you'll likely need to water twice a week and if your soil is sandy, you may need to water three times.

You may be able to get to a once a week watering schedule, but if possible, you should not water on a schedule based on the calendar, but instead watch the lawn for signs of stress. When you see signs of stress, such as grass blades turning dull or gray, grass staying down in your footprints as you walk across the lawn, etc, water deeply.

thanks

I had a bluegrass lawn in the mts of NM. I agree that night watering should not be causing a problem. Also, it is likely that you will need to water 2x per week, but yes, on an established lawn, 3x is almost certainly too much even at that arid altitude.

New poster: You should start a new thread.

You are mowing too low, you aren't fertilizing or overseeding (you have to with fescue, which is what you probably have), and you probably don't water when you should.