Topsoil installation vs crabgrass HELP

Discussion in 'Pesticide & Herbicide Application' started by g&MWorkslandscape, Jul 30, 2013.

  1. g&MWorkslandscape

    g&MWorkslandscape LawnSite Member
    Posts: 17

    Hey I live in New York and did some topsoil installation and seed about a month ago. Now every grass that I installed topsoil on has crab grass in those spots. Why is that? HELP!
     
  2. g&MWorkslandscape

    g&MWorkslandscape LawnSite Member
    Posts: 17

    Also I put crab grass pre emergent down at the end of march is that to early?
     
  3. RigglePLC

    RigglePLC LawnSite Fanatic
    Posts: 11,903

    Timing of crab control sounds about right. Working up the soil to plant new grass breaks the crabgrass barrier--crabgrass seeds buried in the soil may then arise.

    OR...the soil you used could have had last year's crabgrass seed in it. Not likely.

    Try Ortho's Weed and Crabgrass Control. If not, frost will kill crabgrass in October.
     
  4. g&MWorkslandscape

    g&MWorkslandscape LawnSite Member
    Posts: 17

    but wont the crabgrass just turn brown at this point... in which I cant seed during this time of year bc it is to hot?
     
  5. foreplease

    foreplease LawnSite Bronze Member
    Posts: 1,895

    It was kind of too hot about a month ago. You will have less trouble with new crabgrass germinating at this time than you did then. Riggle knows more about seeding in hot weather than I do but I know he is a believer.
     
  6. Smallaxe

    Smallaxe LawnSite Fanatic
    Posts: 10,080

    You brought in topsoil??? in late June , early July and seeded it down with grass seed??? CG is always going to be a problem at that time of year if the soil is contaminated with CG...
    The pre-m you put on the lawn in March is not going to affect the topsoil brought in later...
     
  7. RigglePLC

    RigglePLC LawnSite Fanatic
    Posts: 11,903

    Here is a spot of crabgrass sprayed with quinclorac on my lawn about 4 days ago, July 27th. It is OK to reseed right away--if I wanted.

    It is best in the northern states to wait to reseed until about mid-August, or when temps come down below 85. Or...about 8 weeks before frost. Cool night temps will block crabgrass germination and early growth in the fall. Crabgrass is not a problem when temps cool off in the fall.

    Grass seed sprouts fast In August (if the soil is moist) because the soil temperature is high.

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