Growers have new flexibility in their fall weed control programs following the approval of post-emergence use of Proclus and Bandul in winter wheat and barley. The changes are expected to help strengthen strategies against problematic grass weeds such as blackgrass.
Farmers can now apply either herbicide, both based on aclonifen, at 0.4 liters/ha from emergence to the four-leaf stage. Since its introduction in 2020, it has been limited to pre-germination timing.
Bayer technology specialist Jamie Oakley said the update allows growers to fine-tune their programs more precisely. “Current data show that dividing the dose can improve the longevity of protection without compromising initial weed control,” he explained.
The maximum seasonal dose for Proclus or Bandur remains at 1.4 l/ha. For winter wheat, this can be applied completely before emergence or divided as 1 l/ha before emergence followed by 0.4 l/ha after emergence.
For winter barley, the pre-emergence limit is still 1 l/ha, but growers can now follow this at 0.4 l/ha post-emergence, allowing them to manage more difficult weed populations such as late-emerging grass weeds that often escape early treatment.
If neither product is applied pre-emergent, Oakley said 0.4 liters/ha can be added to the post-emergent tank mix. “This adds something to the tank mix for follow-up applications, which are becoming increasingly important for weed control,” he noted.
Oakley added that this season’s trials will provide further insight into optimal program design. One benefit of the new timing is improved control of broadleaf weeds. Although aclonifen already shows strong activity, many broadleaf weeds naturally emerge after the typical effective period. Both products now carry a broader label that extends their suitability for winter beans.
“This is all about simplifying things for farmers and shop owners, making it easier to plan and use herbicides in the field,” Mr Oakley said. He added that winter beans are an example of Proclus and Bandurus “potentially being introduced to cereals and beans in the same fall.”
