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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.
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.
Glyphosate 2-4 weeks before seeding is OK.
After seeding, Holster /Crossbar or Greenor/Interfix both OK after 2 months.
Im sure someone mentioned to me usin Polax at half strength but I cant remember who and no one else has since!
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.
Just spotted, the polax label also has the same weed/rate table.
Why have you been ask to spray and why have you suggested leaving till spring?