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Crop Advice & Expertise

5 ways to optimise grass-weed control timings

Conditions and application accuracy are crucial to ensure the best grass-weed control results, says Bayer’s Jack Hill. Here are his 5 tips to optimise grass-weed control.


1. Growth stage

Black-grass needs to be targeted when it is relatively small, ideally somewhere between growth stages 11 and 13, when the weed has one to three true leaves.

2. Water

Water rates should be 100 L/ha with a forward speed of 12 km/h, preferably with a flat fan nozzle to maximise coverage. 

3. Adjuvant

If you’re using a mesosulfuron-based product, use 1L/ha of Biopower as the appropriate adjuvant. 

4. Leaf conditions

Black-grass needs to be targeted when it is actively growing in order to maximise the uptake of the herbicide. Also ensure that herbicides are applied to a dry leaf or a drying leaf, allowing a maximum of two hours to dry after application. 

5. Herbicide

If you’re targeting a mix of grass- and broad-leaved weeds, then Bayer recommends Pacifica Plus (mesosulfuron + iodosulfuron + amidosulfuron) at 0.4 kg/ha from 1 Feb, or 0.5 kg/ha after 1 March. Where black-grass or other grass-weeds are the primary target, then 0.33 kg/ha of Monolith is a good option.

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