Kerb Weather Data 2011 Final Report

In most areas soil temperatures are between 6°C to 10°C and rainfall is reducing soil moisture deficits.

Conditions are now suitable for application of Kerb Flo for blackgrass. Kerb Flo can be applied in frosty conditions, but utmost care must be taken to ensure no treatments reach watercourses.

What about spraying advanced crop canopies?

Treating large advanced crop canopies is a concern for many. Ideally treatments should be delayed until winter die-back or grazing by pigeons allows application to reach the soil surface. However this is not a realistic option. Product degradation of Kerb Flo is unlikely on the leaf as degradation is by microbial action in the soil. With sufficient rain, any Kerb Flo that has dried on the leaf will dissolve and drop-down onto the soil surface but coverage of the soil may not be ideal.

If faced with this situation when spraying Kerb Flo, use a minimum water volume of 200 L/ha, a medium to coarse spray and apply when the crop canopy is moist.

For optimal performance for blackgrass from propyzamide we recommend applications are made when soil temperatures have got down to 10 0C and falling, and soil moisture deficit is no more than 50 mm (and falling) at 30 cms. The investment Dow AgroSciences has made in developing and refining this advice means that Kerb Flo is now regarded as a much more reliable herbicide for the control of blackgrass than it was 10 years ago. 


  

 


  

Best Advice - Kerb Application

  1. Propyzamide, the active ingredient in Kerb Flo, is a residual herbicide with root uptake that requires even distribution in the soil profile.
  2. Applications should be made to firm, moist soils with a fine tilth.
  3. Applications must be made to small blackgrass plants, before they tiller.
  4. The temptation to make early applications should be avoided.
  5. Increased rates should be used under warm autumn/winter condition.
  6. Increased rates should be used where blackgrass resistance has been confirmed.
  7. Crop shading can interfere with even distribution to the soil.
  8. Strategic use is recommended in tank mix or sequence with graminicides.
  9. Always follow the Voluntary Initiative guidelines (Use 6 m buffer strip or 5 m no spray zone beside water courses).