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Black-grass Chemical Control


- Post-emergence herbicide options like meso/iodosulfuron cannot always be relied on for high levels of control

- Pre-emergence herbicides are therefore now THE key component in herbicide programmes

Post-em still working? Future-proof your black-grass control!

- Even where post-em sprays are working, pre-em stacking has a role to play

- Early weed removal is critical - the later you leave black-grass control the bigger the yield penalty

- Controlling earlier with a robust pre-em puts less pressure on post-emergence herbicide use later, reducing resistance risk


- Flufenacet is often the base treatment, but in most cases does not deliver enough control on its own. 'Stacking' residuals has been clearly shown to improve results, but it is important to find the best partner

- ALS target site resistance is increasing. In these populations, sulfonyl urea chemistry (e.g. flupyrsulfuron - FPU) will not perform well.

- DEFY's mode of action is not affected by ALS target site resistance, which is believed to be behind its more consistent results


DEFY is the first choice mix partner and a cost-effective way to add more black-grass control:

- Delivers more control per £ spend than PDM, FPU or triallate granules

- Consistent control, not affected by target-site resistance

- Delivers £133.50/ha MOIC*

*Source: 3 year average across 20 trials. Margin Over Input Cost based on potential yield loss of 20% in medium black-grass population, 10 t/ha yield and wheat price of £115/tonne.

Black-grass graph DEFY

Source: Syngenta Autumn 2015 Trials in Cambridge, Horncastle & Oxford. Liberator Rate: FFCT 240g/ha + DFF 60g/ha.