For grass weed control in oilseed rape, operators face the extra problem of crop shading emerging target seedlings – the best rates of control are achieved by early applications at the one to two leaf stage. Finer droplets are required to wet shiny grass leaves and generate sideways movement to get under leaves. As the crop progresses through the growth stages the canopy becomes closed to apply fungicides bellow the canopy the Amistar nozzle is recommended.
Timing
Water volume (l/ha)*
Forward speed
Best nozzle
Reduced drift option
Pre-em herbicides
200 l/ha
<12 km/h
3D ninety alternating forwards and back
3D ninety alternating forwards and back
Post-em herbicides
100 and above
<12 km/h
3D alternating forwards and back
3D nozzle (worst case AMISTAR nozzle)
All fungicides
100 and above
<12 km/h
AMISTAR nozzles
AMISTAR nozzle
Pollen beetle
100 and above
<12 km/h
3D alternating forwards and back
AMISTAR nozzle
*Please refer to the product label for water volumes. Growers can reduce water volumes as long as they adhere to the HSE/DEFRA Code of Practice for Using Plant Protection Products. Please refer to paragraph 4.6.4, page 81 of the HSE/DEFRA Code of Practice for Using Plant Protection Products.
