Herbicide on DD wheat on the green

Discussion in 'Direct Drilling Crops & Agronomy' started by ChrisStep, Aug 23, 2018.

  1. ChrisStep

    ChrisStep New Member

    I'm planning to spray glyphosate onto rape volunteers then tine drill wheat the next day (1 inch dutch opener). Is there any point in spraying my usual pre-em mix of Liberator / pendimethalin onto 100 green cover OSR volunteers? Am I best leaving it and spraying post emergence when the cover has died back, or not bothering at all?
  2. Tractor Boy

    Tractor Boy Member

    In my opinion it depends how big the volunteers are. If they are only small plants I would drill and then mix the glyphosate and pre em together after drilling but obviously pre em. If, however, the volunteers are large plants then I think you will have to let them die back after glyphosate and then put your usual mix on or your pre em will get very poor ground coverage. It may well become a very early post em in that case.
    SilliamWhale likes this.
  3. jack6480

    jack6480 Member

    south lancs!
    I’m planning on drilling into large cover of rape with weaving and just round up no pre em or post em, worked last year
  4. I used weaving gd then applied prem plus avadex and glyphosate as late after drilling as I dare wait last year
    least amount of black grass in the wheat compared to last few times the fields were wheat

    never had a problem with prem and surface cover
    the cover may delay bg emergence and thus give the prem a chance to be washed in
    or the delayed bg is weak before the winter comes and frost finishes it off

    the other big plus for leaving a strong osr cover until after drilling is that there is plenty of osr for the slugs so they leave the wheat seed and seedlings alone until the osr has disappeared and the wheat is past the most susceptible stage
    GeorgeK, martian and Clive like this.
  5. Clive

    Clive Staff Member

    Why are you spraying glyphosate pre drilling ? Better to spray it a few days post drilling

    If you are going to pre em you can do it with the glyphosate as well that way

    Personally I would do the post drill glyphosate and shut the gate until spring unless there is a big grassweed issue to sort

    Agree 100% with @yellow belly above re slugs - keep them eating volenteer OSR as long as you can, until it’s gone they won’t touch the wheat
    GeorgeK, britt and SilliamWhale like this.
  6. jack6480

    jack6480 Member

    south lancs!
    My fields are well covered in osr volunteers now, should I stubble rake again now to knock a few out or leave till I drill wheat
    solo likes this.
  7. James W

    James W Member

    Pre em unlikely to be worthwhile unless soil is wetter than damp from drilling to black grass chitting, the umbrella effect make it less effective
  8. chaffcutter

    chaffcutter Moderator

    S. Staffs
    No don’t rake it, more rape to drill into the better for feeding the slugs
    jack6480 and Clive like this.
  9. jack6480

    jack6480 Member

    south lancs!

    All drilled rolled and 2 kg/ha of slug pellets gone on last week. Looking good so far will be up in the next day or two
    GeorgeK, SilliamWhale and Clive like this.
  10. Badshot

    Badshot Member

    If you've bg to control the pre em needs to hit soil.
    I drilled into thick volunteers with my KV.
    I roundupped out the areas that were thickest before next harvest.
    James W likes this.
  11. If the rape had a lot of bg in it that seeded is wheat the best crop

    In my notill after rape the amount of bg that seeds is very low
    Where the bg seeds it is because the rape is very poor and there are few rape volunteers
    The thicker the rape the less bg

    I sprayed my wheat after rape last Friday the 12 mm rain washed in the pre em

    In 2017 the blocks planted after rape had the lowest amount of bg in the wheat those fields have had since burning ploughing ipu and antlants notill since 2011 or 2012

    Residual herbicides work much better in notill than any trial indicates due to the shallow rooting of the bg
    Kerb liberator pendimetalin avadex in the high 80 % at worst often above 90%
    This combined with spring crops reduces bg year on year
    In future earlier wheat drilling in late September will be the norm
    Later drilling means spring crops in my book better planned than forced when October is too wet
    martian and Will Blackburn like this.

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