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Possible fungus?? Necrotic Rings??? see pic


Lawn Maintenance / Lawn Renovation

A great way to talk about all things lawn care related. Grass, turf, shrubs, trees, aeration, fertilization, reseeding, hydro-seeding, mowing, grub control, chemicals and pesticides. Ask questions, give answers. Grow!
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Old 06-03-2012, 12:43 AM
shawnhonz shawnhonz is offline
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Default Possible fungus?? Necrotic Rings??? see pic

These have been popping up in a new HOA community I just acquired. I think it's Necrotic ring spots?? Im here in Denver, CO where most lawns are Kentucky Bluegrass. Whats the best way to treat and prevent this stuff? Thanks!
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Old 06-04-2012, 01:28 PM
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That looks like it to me as well.

I think it is a fungus that can be transmitted from lawn to lawn via the underside of the mower so you need to keep the underside of your mower clean after mowing an infected lawn like that. We have talked in the past on here about how to do that. You will most likely need some bleach solution to do it properly.

Keep your blades sharp because torn grass is more easily infected.

Fertilize it with nitrogen and over seed with a grass seed that is resistant to it.

Does anyone else have any more thoughts on this?
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Old 06-14-2012, 05:44 AM
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Hey shawnhonz

Looks like necrotic ring spot to me. It's rather difficult to control, fungicides work best as a preventive but also do:

Limiting nitrogen applications
A morning watering schedule
Keeping thatch to a minimum
Lawn aeration
Improve drainage

Hope this helps
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Old 07-12-2012, 05:39 PM
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Default Necrotic Ring spot-looking better

I first power raked the areas with heavy thatch and got about 9 bags full of thatch buildup. Put down a soil conditioner (Revive granules) then over-seeded the spots with a ryegrass mix (more tolerant to disease) and then covered with top soil. I also adjusted the watering schedule with a cycle/soak program.
It's not a miraculous difference but it looks a heck of a lot better. I will put up pics in a few days!!

Thanks for the tips guys

Shawnhonz
Denver, CO
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Old 07-12-2012, 09:58 PM
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It's ferry ring, or fairy ring (not sure how it's spelled). Do not put a fungicide on it it will go away on its own once the weather changes.
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Old 07-12-2012, 10:03 PM
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Quote:
Originally Posted by shawnhonz View Post
I first power raked the areas with heavy thatch and got about 9 bags full of thatch buildup. Put down a soil conditioner (Revive granules) then over-seeded the spots with a ryegrass mix (more tolerant to disease) and then covered with top soil. I also adjusted the watering schedule with a cycle/soak program.
It's not a miraculous difference but it looks a heck of a lot better. I will put up pics in a few days!!

Thanks for the tips guys

Shawnhonz
Denver, CO
Oh OK, or you can mess with and see what happens. Should have read a little more.
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Old 07-13-2012, 11:32 AM
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It's not a miraculous difference but it looks a heck of a lot better. I will put up pics in a few days!!
I look forwards to seeing your updates and pics!
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Old 11-12-2012, 06:00 AM
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20120807_164826


Here are the pics from the NRS fungus and the after pics from all the work i did to get rid of the fungus
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Old 11-12-2012, 01:51 PM
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That looks great! What steps did you go with to treat the lawn?
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Old 11-12-2012, 10:34 PM
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Fungus? In November? that seems odd.... as i have always been told warm and humid conditions are favorable for fungus. Alternating your modes of action with a fungicide seems to be effective. There are preventive and curative fungicides available. Although, you did say you had heavy thatch build up.... thats the downside to Kentucky Blue. Combing the lawn once a year may be a preventive practice. Anyways, glad you found a cure. Also, just a tip you want 1 part bleach to 10 parts water when disinfecting a piece of machinery
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