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St Augustine Diagnosis

Discussion in 'Pesticide & Herbicide Application' started by ArTurf, Aug 12, 2012.

  1. ArTurf

    ArTurf LawnSite Gold Member
    Male, from Ark
    Posts: 3,458

    What do you think is going on with this St Aug? I will be the first to admit I am not good at disease ID. Really haven't had too much of a problem in the past. I know this is not a water issue. We have been in a drought as most of the country then we had a week where it rained alot and then I noticed these spots showing up on several St Aug yard. I seems to start with the tip of the leaf yellowing and then spots seem to die out. Maybe I just happened to notice it after the rain but it seemed to be related time wise. I was thinking Brown patch but doesn't that usually show up in cooler temps? It is very warm here 90-100+. Any thoughts?
  2. ArTurf

    ArTurf LawnSite Gold Member
    Male, from Ark
    Posts: 3,458

    Trying to upload pics if not on this post it will be later.
    Last edited: Aug 12, 2012
  3. ted putnam

    ted putnam LawnSite Platinum Member
    Posts: 4,539

    Could be "hot spots". Have you probed for buried debris? I am starting to see grubs in some areas due to attractiveness of stressed turf. Mostly in zoysia but then again, I don't care for much St. Aug.
  4. Patriot Services

    Patriot Services LawnSite Fanatic
    Posts: 12,887

    Looking on a smart phone so pic is hard to look at. Looks too short and with dull blades. With these temps SA does its best at 4~5".
    Posted via Mobile Device
  5. ArTurf

    ArTurf LawnSite Gold Member
    Male, from Ark
    Posts: 3,458

    Not that. This grass is maintained at 4". I sharpen my blades often but if they were dull at the end of the day I am very sure that is not it, very localized not everywhere.
  6. Landscape Poet

    Landscape Poet LawnSite Gold Member
    Posts: 3,638

    With the dry patterns you say you have experienced, as has most of the country, have you inspected for chinch bugs? I notice in picture two that both spots are not in the shade of the tree, it appears that the area has been wiped clean from what could be the pest eating inside outward.

    It is very hard to diagnose of the internet but I would suggest taking a look for them. You mentioned that some slight yellowing had occurred prior..I have scene this prior to finding a infestation.

    That would be my guess as if your area is in drought I doubt GLS was the issue and given that the area seems to be wiped out instead of thinned, I am betting Chinch Bug, but again this is at best a decent guess as I am trying to due so from two distant pictures from hundreds of miles away.
  7. GreenThumb11

    GreenThumb11 LawnSite Member
    Posts: 46

    99% sure it's chinch bugs on 2nd picture. We see alot of damage from chinch bugs in st Augustine.
    Posted via Mobile Device
  8. ArTurf

    ArTurf LawnSite Gold Member
    Male, from Ark
    Posts: 3,458

    I will check for chinch bugs tomorrow.
  9. RAlmaroad

    RAlmaroad LawnSite Silver Member
    from SC
    Posts: 2,194

    Go ahead and check for clinch bugs and also while you're out there, take some very close up of the leaves and stolons. Also do the old pull on the stolon test to see if the center sections slides out or breaks off. If it slide out with a slimy feel, could be summer patch. Anyway get back with what you find. Also take some liquid sevin and spray the surrounding area. If you do find clinch bugs, the Sevin will slow them down until you can get the Imidacloprid.
  10. Greg Amann

    Greg Amann LawnSite Member
    Posts: 161

    Use your hands and rake the brown thatch off of the top. Check to see if you have young green growth coming back on the stolons in the damaged areas. If so, I would say you are seeing areas that were under drought stress prior to the rains. The rain helps perk up the grass in the surrounding areas making the stressed areas look worse.

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