4. Chemistry

Get the most from your pre and post-emergence herbicides.

Herbicides are the back-stop of any robust control programme

Choose herbicides with different modes of action throughout the rotation to reduce the selection pressure. And use them at the right time.

For residuals, this is at true pre-emergence – within 48 hours of drilling the crop ideally. For post-emergence applications in autumn, spray your contact herbicide when black-grass is at the 1-3 leaf stage (GS11-13).

5 Things to consider when planning your herbicide programme for black-grass control

  1. Make sure all cultural control methods possible have been completed
  2. Prepare a good soil surface for your pre-emergence chemistry; a fine consolidated seed bed free from clods and trash gives them the best chance to work
  3. Apply your pre-emergence herbicide at the optimal pre-emergence timing – don’t let weeds germinate before application as this will lead to reduced control
  4. Apply your contact herbicide when weeds are at the correct growth stage, GS11 – 13 for Atlantis WG and are actively growing
  5. Pay close attention to application set up for all spray operations.  With herbicides this can make a big difference, keep forward speed to 12 kph maximum, and use the correct nozzle, boom height and water volume for each herbicide type
  • Getting the best out of post-emergence herbicides for black-grass control 

    Controlling black-grass, once it has emerged in the crop should be considered the last resort. Before this point, every opportunity should have been taken to minimise the amount that will emerge in the crop using cultural control techniques, such as cultivations, delayed drilling, rotation and improved drainage.

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  • Optimise Atlantis WG applications 

    When it comes to herbicide applications black-grass is a notoriously tricky target. At the one to three-leaf timing - when Atlantis WG (mesosulfuron and iodosulfuron) is most effective - black-grass is only 2-3cm tall with thin vertical leaves just millimetres wide.

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  • Autumn black-grass battle enters crucial phase 

    The next two weeks are ‘crunch time’ for the battle to control black-grass in this year’s wheat crop, Bayer CropScience has advised growers.

    Reporting on monitoring from its field team, the Atlantis WG (mesosulfuron + iodosulfuron) manufacturer says a largely successful pre-emergence campaign based on a variety of flufenacet products has delivered ‘excellent’ control so far. But it’s warned that waiting until spring to resume the control programme could allow the weed to gain an unwanted foothold in many crops, a position backed up with the release of new independent trials data.

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  • It’s time for black-grass control with Atlantis WG 

    Forecasts suggest it’s time for Atlantis WG.

    Forecasts for continued mild weather into November should focus growers’ minds on controlling black-grass this autumn, rather than relying on pre-em chemistry to ‘hold’ control over until spring.

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