treating new grass seeded lawn with pesticides

Two quick questions here guys. What is it acceptable to use on a new-ish (3 months at most) lawn from seed to deal with some of the germinating weeds?

What can I treat a seedbed with before sowing grass seed that wont affect germination but will deal with most of the germinated weeds?

Thanks folks


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  • I think the idea is to prepare the bed a few weeks before seeding so you have time to allow weeds to germinate and treat them with glyphosate before seeding it.
  • PRO
    Glypho Roundup can be used on area to be used as a seed bed with at least 14-21 days lapsed before seeding.

    Once seeded, I think it's several months before you can treat with any pesticide as otherwise it knocks the germination / kills the new grass as its too suspectical to the pesticide strength

    The statuary product label normally clarifies these time periods in the notes and may vary between otherwise similar products.
  • PRO

    For newly sown lawns Holster XL  selective has the shortest time window I know of. Lawns can be treated after 2 months according to the label. Ive sprayed turfed and seeded areas after 3 months in good growing conditions with no problems.

  • I have successfully seeded golf greens from scratch on sterilized rootzone you will always get weeds coming in hand pick them for first 2 to 3 months then spray with a quality selective.then apply a low rate fertiliser half recommended app rate
  • PRO

    Glyphosate 2-4 weeks before seeding is OK.

    After seeding, Holster /Crossbar or Greenor/Interfix both OK after 2 months.

    • I totally agree but like I said you will still have to hand weed for the early stages of growth as the weeds are competing with the grass
  • PRO

    Im sure someone mentioned to me usin Polax at half strength but I cant remember who and no one else has since!

  • PRO

    Polax / Praxis / Mogul are all similar. The polax label says 2 months also, so should be ok, though care needed if seeding later in season. The mogul label on the Agrigem site has more info on types on weeds and rates from 1L/Ha to 2L/Ha.

  • PRO

    Just spotted, the polax label also has the same weed/rate table.

  • PRO

    Why have you been ask to spray and why have you suggested leaving till spring?

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