Brown patches - Root cause ?

Discussion in 'Pesticide & Herbicide Application' started by bperl, May 17, 2012.

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Brown patch - Root Cause

Poll closed Jun 6, 2012.
  1. Too much herbicide

    0 vote(s)
    0.0%
  2. Blunt Mower blades

    0 vote(s)
    0.0%
  3. Beetles and grubs

    0 vote(s)
    0.0%
  4. Excessive fertilizer

    8.3%
  5. Fungus

    100.0%
Multiple votes are allowed.
  1. bperl

    bperl LawnSite Member
    Posts: 37

    Background Info:

    Location: Northern Virginia.
    Brought a home last year and the lawn was infested with 90% weeds.
    Took the complete renovation project last fall.
    Killed all the vegetation using roundup around 2nd week of September.
    Got irrigation installed
    De thatched, Aerated and planted TTTF with compost and fertilizers.
    Lawn came up beautifully. This spring lot of chick weed showed up. Didn't use any herbicides till March '12.
    Sprayed Weed b gone Max twice - Once in April and again during 1st week of May. Weeds are gone. But I see brown patches in my lawn.

    Don't have any pets. Lawnmower is 9 months old. I've attached the pics. What could be the cause of these patches and how do I narrow the root cause?

    0711.jpg

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  2. RigglePLC

    RigglePLC LawnSite Fanatic
    Posts: 12,118

    Not sure. If the dead spot has a green ring around it--that is a sign of a dog spot. put out a few mole traps--and--watch the dog walkers pull their dogs away from the mole traps.
    But there could be some fungus mold from last winter--particularly if the seed mixture contained a percentage of perennial rye. Uneven green sometimes results if the seed had a mixture of types of grass.

    Has it been hot and humid? Then fungus is a possibility.
     
  3. bperl

    bperl LawnSite Member
    Posts: 37

    As you can see browning is happening even in parts of lawn where outsiders would not bring their pets (near my driveway). Temperature has been around 75-80 lately with couple of days of rain (1.5 inch in couple of days). Other than that its not unusually humid or wet.
     
  4. shovelracer

    shovelracer LawnSite Silver Member
    Posts: 2,009

    Is there any color to any of these areas? Any pink or reddish colors, blogs that look like bubble gum or brown grass with reddish hues?
     
  5. lawnrx

    lawnrx LawnSite Member
    from ga
    Posts: 140

    Check for insects. Looks like insect damage. Spray insecticide just to rule it out ASAP.
     
  6. bperl

    bperl LawnSite Member
    Posts: 37

    I don't see any reddish or pink colors. I have uploaded few more photos.
     
  7. bperl

    bperl LawnSite Member
    Posts: 37

    I had the same doubt so I've applied 'Spectracide Triazicide Insert Killer' granular product for the complete lawn about 2 weeks back. Not sure when I would see the difference if thats the root cause.
     
  8. bperl

    bperl LawnSite Member
    Posts: 37

    Took them today morning after watering.

    0719.jpg

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  9. cwc257

    cwc257 LawnSite Member
    Posts: 24

    Looks like your lawn has a turf disease. It's hard to tell exactly by only seeing pictures but, my best guess is melting out/lead spot. With melting out you will typically see the blades of the infected area turn a purplish color and the shorter, younger grass blades start to die off. Another possibility is dollar spot. Dollar spot looks small round sunken patches of turf that turn straw colored. The lesions on the grass will have more of a reddish brown border.
    My guess is melting out but can't tell all that well from only seeig pics. A fungicide like heritage g or headway covers both, but you should properly identify the problem before buying a fungicide.
    Posted via Mobile Device
     
  10. RigglePLC

    RigglePLC LawnSite Fanatic
    Posts: 12,118

    Picture on the red pavement--looks like dollarspot. Did this happen when weather turned warm and rainy--or did it appear when it greened up in spring?
    If it happened recently, I say its dollarspot. Look for band of creamy white across the leaf blade, often with reddish borders. Also many of the leaf blades will be creamy white from tip to about 2 inches down. What kind of seed? Rye/blue? or?
     

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