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View Full Version : Possible fungus?? Necrotic Rings??? see pic


shawnhonz
06-03-2012, 01:43 AM
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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Steve
06-04-2012, 02:28 PM
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?

Dr Blade
06-14-2012, 06:44 AM
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

shawnhonz
07-12-2012, 06:39 PM
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

Godslapper
07-12-2012, 10:58 PM
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.

Godslapper
07-12-2012, 11:03 PM
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.

Steve
07-13-2012, 12:32 PM
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!

shawnhonz
11-12-2012, 07:00 AM
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Here are the pics from the NRS fungus and the after pics from all the work i did to get rid of the fungus

Steve
11-12-2012, 02:51 PM
That looks great! What steps did you go with to treat the lawn?

TheGrassGuru
11-12-2012, 11:34 PM
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

shawnhonz
11-13-2012, 05:24 AM
This pic was actually from the end of July. I've been swamped with work and haven't had a chance to get on here.

First I power Raked the lawn(s) and removed the thatch, Then I aerated the affected areas really well. I then put a generous layer of rye/bluegrass mix seed down and top coated with compost mix. I adjusted the watering schedules and after about 3-4 weeks I started to see results.

Thanks for all the great tips and ideas guys!!!!

Steve
11-13-2012, 11:37 AM
Very nice work!

Do you think you might be able to use those before and after pictures in your future marketing campaign? I bet that could really help.

shawnhonz
11-21-2012, 06:05 PM
Yes, I already am using those now on a brochure as well as my website

Lake Area Turf
11-23-2012, 11:52 AM
Necrotic ring spot is caused by a fungus that attacks the root system. symptoms will appear durring periods of drought and or heat stress. Extremely difficult to detect until damage has occurred. For that reason chemical control would not be a recomendation. Cultural control is the best way to combat, just like you did. Very nice. I wouldnt be as concerned about tracking the disease to other lawns with your mwing eqt. as I would with your culturatl eqt. ( Aerators, detatchers etc. ) Remeber NRS and the other patch diseases attack the roots and subside in the soil not on the foliage. Not uncommon to see disease in cooler dryer conditions as there are many, many pathogens that thrive on many different conditions.