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St. Augustine Sod Webworm

Discussion in 'Pesticide & Herbicide Application' started by lep, Oct 24, 2009.

  1. lep

    lep LawnSite Member
    from Texas
    Posts: 52

    Our St. Augustine turf (Houston) was in excellent shape all summer long after doing significant work. In the first week of October, however, there was a very bad sod webworm infestation to the point that whole sections (15 x 10 feet) were wiped out -- and all you could see was brown thatch because there was no live green grass left.

    I took some lawn samples to Southwest Fertilizer (in Houston) and they said to apply bifenthrin, which is a topical insecticide. A week later I applied Bayer Complete insecticide spray at dusk, since sod webworms feed on the grass at night. This seemed to work well, and now the turf is growing back, but slowly since the root structure gets wiped out and also because it's a little cooler now.

    In addition, I applied Immunox Sprectracide anti-fungal spray to control some dollar spot and brown patch fungus growth that was occuring.

    Last, now that the weather is cooling, we only need to water once a week. In fact, in the South, a trick for having a healthy green St. Augustine turf throughout the winter is to only water once a week. :)
  2. lep

    lep LawnSite Member
    from Texas
    Posts: 52

    BTW, I applied Bayer complete since it is a "systemic" which gets taken up by the lawn. Any insects that feed on the lawn containing a systemic insecticide will "buy the farm", i.e., die. A topical insecticide such as bifenthrin, is not taken up by the plant, but works by exposing insects to the insecticide that's distributed on the surface of the turf.
  3. We have been having a lot of grey spot fungus down here the past 2 months. I have one customer who has it all over his front lawn.
  4. LawnoftheMonth

    LawnoftheMonth LawnSite Senior Member
    Posts: 355

    Houston had all kinds of things going on in October. Armyworms, Rhizoctonia Brown Patch, lingering Chinch Bugs and Sod Web
    worms....and winter annuals are germinating now, too.
  5. Landscape Poet

    Landscape Poet LawnSite Gold Member
    Posts: 3,638

    To say that we have had a lot is a understatement - it has been out of control - i just got called last week to a house out of my normal area - landscaper there had told the guy he had chinch and replaced sod - 3 times - LOL - I went up and there was not a sign of chinch however fungus is rocking it out - soil correction time for that yard

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