Is this Grub Damage?

Discussion in 'Turf Renovation' started by QuadRacer041, Oct 4, 2005.

  1. QuadRacer041

    QuadRacer041 LawnSite Senior Member
    Messages: 365

    here are a few pics of 2 of my lawns.Does this look like grub damage?
    they were treated for grub's by a company i sub contract out.

    the last pic is the same house just differnt section of lawn

    IMG_0375 (Medium).jpg

    IMG_0376 (Medium).jpg

    IMG_0378 (Medium).jpg
  2. Roger

    Roger LawnSite Fanatic
    Messages: 5,943

    If it is grub damage, the brown turf should pull up easily. The depth of the "plug" should be about 1 1/2". You should easily see grubs under the "plug." At least that is how one can tell grub damage in my area.

    However, in my area, the grub damage does not tend to be widespread. The spots tend to be isolated, a 6" diameter spot here, a 12" one there, another at 10" and the like. By this time of the season, any grub infested area has been dug up by skunks, pulling back the sod chunks to get easy access to the grubs. The skunks will tear up large chunks, so that the turf is so uneven it cannot be mowed across. It looks like somebody used a mattox to dug up a top layer of turf.
  3. mishmosh

    mishmosh LawnSite Member
    from OH
    Messages: 45

    Like Roger mentions, if the dead area pulls up easily, it is almost certainly grub damage. From looks alone, I would bet money on it though.
  4. turfsurfer

    turfsurfer LawnSite Senior Member
    Messages: 364

    From looks alone it most certainly CANNOT be said to be grub damage. Looks like there are clumps of tall fescue that were left alone within the brown areas. Check for a surface insect like Chinch bug or Billbug, they will usually go around tall fescue.. If it IS grub damage, as stated earlier it is very easy to tell by seeing if it pulls up like loose carpet.
  5. Az Gardener

    Az Gardener LawnSite Gold Member
    Messages: 3,899

    What is the variety of turf? I usually see bird holes, they seem to know where the grubs are. I don't know if you get pearle scale there but that is also a possibility. Dig on the fringe of the live grass if you have grubs they should be easy to find. If its pearle scale there will be tiny pearls off white to light pink in color, just below the thatch layer. They are about the size of a pin head or a small fertilizer prill. Pray for grubs you can kill those.
  6. Runner

    Runner LawnSite Fanatic
    Messages: 13,497

    It IS rather odd that there are tufts of grass left standing, but I've seen it before with grub damage. Pull the stuff up, and pull back 6 to 12 inches on the outside of the area and you will see the grubs.
  7. Jason Rose

    Jason Rose LawnSite Fanatic
    Messages: 5,858

    A shovel is the easiest way to find grubs. Like stated, go the the fringe between the green and brown and dig a 6" diameter spot a couple inches deep and see if you find any. you can pick thru the soil on the roots and check there too. With no bird holes I'd doubt that there are grubs there. But really going by that, or skunk activity is pretty vague... What if there isn't many birds in the area, and no skunks?

    I also recall from Pesticide training class there is one brand of laundry detergent you can use mixed with water (borax or tide) and pour it over a 3'x3' area and within X minutes the grubs, or whatever worm it was, will come spilling to the surface, allowing you to count the population. Iv'e never tried it, but I know it's a method to use.
  8. PurpHaze

    PurpHaze LawnSite Fanatic
    Messages: 5,496

    It does work and it's an alternative to the pyrethrin test. Irritates the snot out of them and sends them to the surface. If you discover too many then you have a problem and will have to treat. I'd have to get into my QAC stuff to get more info but if you do an Internet search of "pyrethrin test" you'll come up with invaluable info including pictures of various damaged turfgrasses. It will also tell you which times of the year to test for different insects and how to treat.
  9. QuadRacer041

    QuadRacer041 LawnSite Senior Member
    Messages: 365

    the spots do NOT pull up feels like the roots are still in there pretty good.when i pull a section up i dont see any grubs at all, im thinking it may be chinch bugs.i want to add that i am in north jersey, it has been a very hot humid summer with very litle rain.what ever this is looks to be a very very commion problem this year.i see it on many other lawns in area's i work.
  10. jd boy

    jd boy LawnSite Member
    from nw ohio
    Messages: 173

    looks like a fungal problem called summer patch. i've never seen grub damage that bad before.

    bayleton will treat the problem and then you will have to re-seed. usually the problem will start small. it usually looks like the turf needs to be watered. The problem is the supplemental water spreads the fungus and this is what you end up with.

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