Help with brown spots

ruru_1July 17, 2014

Our lawn (Bermuda grass with 6.0 PH level) has several of these brown spots in the front and back yard. My question is should I keep watering on them (which I have been doing for the last two weeks) or just do overseeding? I have applied fertilizers four weeks ago and also yesterday.

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dchall_san_antonio(8 San Antonio)

Where do you live?
How are you watering now? How often and how long?
What fertilizers did you apply?

    Bookmark   July 17, 2014 at 11:47AM
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dchall_san_antonio(8 San Antonio)

I should have also mentioned, NO do not overseed. That looks like a hybrid bermuda (sod) lawn. Overseeding with common varieties will give you a permanently weedy lawn. There is no seed that will match your grass. It will repair itself. That's the nature of bermuda.

    Bookmark   July 17, 2014 at 11:49AM
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ruru_1

Thank you for the reply, schall_san_antonio! I live outside of Charlotte and I water once a day for 10-25 minutes everyday. I applied milorganite.

    Bookmark   July 17, 2014 at 12:15PM
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Dellonb

Do you experience full sun in this location or partial shade? This looks similar to damage I caused to my hybrid Bermuda by applying to much fertilizer (Nitrogen). It did heal itself, I mowed it down very low and it regenerated.

    Bookmark   July 17, 2014 at 3:05PM
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ruru_1

Our front and backyard lawn gets full sun, It is possible that the damage came from too much fertilizer. I put down Nitrogen (5-2-0) 4 weeks ago, and some Scotts Liquid Turf Builder (sprayer type) after few days later. I also put down more nitrogen yesterday.

    Bookmark   July 17, 2014 at 4:37PM
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Dellonb

It is possible.... I had over applied mine when the temps. were in the mid 90's and didn't receive any rainfall for almost a week. It burned my lawn, it was a combination of the high heat, lack of water and over application. Hybrid Bermudas can be very sensitive to the proper application of fertilizers.

Assuming this is what caused the brown spots, continue to mow and water as you normally do and they will grow back in.

    Bookmark   July 17, 2014 at 5:07PM
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ruru_1

Thank you Dellobn for the help. Hopefully it gets regenerated in the coming days.

    Bookmark   July 17, 2014 at 5:17PM
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ruru_1

Can anyone tell me if our brown spots are caused by fungus? I am trying to find the exact cause between over fertilization and fungus.

    Bookmark   July 19, 2014 at 2:50PM
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ruru_1

More pic

    Bookmark   July 19, 2014 at 2:52PM
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dchall_san_antonio(8 San Antonio)

If milorganite is the only fertilizer you used, then there is no chance the damage is caused by fertilizer. You don't even need to water that in.

If you are watering every day, then there is an excellent chance it's a fungal disease. Daily watering is about the only thing you can do to induce fungus in bermuda. In your area you should be watering it more like once, deeply, every 10 days to 2 weeks unless it rains. I would try simply not watering every day and see if it greens up again.

Put out some tuna or cat food cans and time your sprinklers to see how long it takes to fill the cans. Then, having just watered the proper amount, sit back for 3 days watching the grass to see if it starts to look brown or mats down when you walk on it. When that happens, water immediately for that same time you timed with the cans. Keep watching the grass for signs of drying and then water. Real soon you'll develop deeper roots which allow the uptake of moisture from deeper in the soil. The deep watering provides that depth of moisture. That will break the weed cycle and hopefully will break the fungus cycle.

If you want to try something which is perfectly safe this time of year, you can apply ordinary corn meal at a rate of 20 pounds per 1,000 square feet. The corn meal attracts a beneficial predatory fungus which feeds on the disease fungus. It will take about 3 weeks to see the improvement. But simply backing waaaaay off on the watering might give the same effect.

    Bookmark   July 20, 2014 at 2:09AM
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