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Liberator is widely recognised as the standard pre-emergence herbicide for early control of grass-weeds and broad-leaved weeds in winter wheat and winter barley. It should form a key part of your anti-resistance strategy and, used in a programme with Atlantis WG (mesosulfuron-methyl and iodosulfuron-methyl-sodium), will provide robust control of black-grass in winter wheat.

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Why Liberator?

Controlling grass-weeds before applying a post-emergence herbicide - such as Atlantis WG in winter wheat - cuts down dramatically the number of weeds that the post-emergence product has to deal with. This reduces the potential to select for resistant individuals. Liberator provides unrivalled pre-emergence control of grass-weeds and black-grass.

Main advantages

  • Safe with all varieties of winter wheat and winter barley
  • Clean, user-friendly, white formulation with low, inoffensive odour
  • Low product and active dose rate
  • Reliable residual control even in dry autumn conditions
  • Winter oilseed rape, winter wheat, winter barley, winter leaf brassicas and winter field beans may be drilled the following autumn
  • Sugar beet, spring wheat, spring barley, potatoes, spring oilseed rape, peas, spring field beans, edible brassicas and onions may be drilled the following spring

Your questions answered

When is the best time to treat with Liberator?

Jack Hill, Bayer black-grass task force member is asked “When is the best time to apply Liberator?” Jack notes that Liberator has been on the market since 2004 and in the trials work which has been done during this time show that Liberator performs best at true pre-emergence which means within 48 hours of drilling. The question Jack often gets asked in his role as Commercial Technical Manager is “is it too dry to apply Liberator?” the answer is that if there is enough moisture to drill then there is enough moisture to get activation of the active ingredient components.


What is the best pre-emergence stacking combination or sequence?

Jon Helliwell, Bayer black-grass task force member is asked “What is the best pre-emergence stacking partners or sequence to use with Liberator?” Jon points out that Bayer carry out trials all over the country to assess the best options for farmers to use for their pre-emergence black-grass control. Liberator provides the best starting point and is a tried and trusted base. Where black-grass is a concern, particularly where resistance is creeping in a tank-mix partner for liberator to boost control is advisable. Active ingredients like prosulfocarb, pendimethalin or triallate in sequence.


What should I mix with Liberator in winter barley?

Catherine Barrett, Bayer black-grass task force member is asked “What should I mix with Liberator in winter barley?” Catherine says that winter barley is a good cropping choice to get on top black-grass because its competitiveness can smother out weeds and prevent subsequent germination. However, it is important to get the crop to the point where it can compete with grass-weeds its important to have a good pre-emergence strategy. Liberator provides the ideal base and to bolster this additional actives such as Diflufenican and Pendimethalin can be added to boost the residual effect. For the latest details on tank mixes visit the Bayer Crop Science document store.


Getting the best from Liberator

We recommend that you apply Liberator pre-emergence, typically within 10 days of drilling. When treating pre-emergence, seed should be covered with a minimum of 32mm of settled soil. Good weed control depends on burying any trash or straw before, or during, seedbed preparation. Seedbeds must have a firm, fine tilth. 

If early spraying for black-grass and rye-grass in winter wheat has been delayed, tank-mix Liberator with Atlantis WG and biopower and apply in the autumn when black-grass is at the one to three-leaf stage.


Important things to remember

  • Always follow WRAG (Weed Resistance Action Group) guidelines for preventing and managing herbicide resistant weed
  • Typical levels of black-grass control provided by a pre-emergence application of Liberator range from 60 to 80%
  • Optimising the control of grass-weeds prior to post-emergence treatment dramatically reduces the population
  • Do not use Liberator as a stand-alone treatment for black-grass control. Use in a tank-mix or sequences with effective herbicides with other modes of action
  • Do not use Liberator as the sole means of controlling grass-weeds and broad-leaved weeds in successive crops

Liberator as part of a programme

Liberator should be used as part of a programme. For the treatment of black-grass and rye-grass in winter wheat it can be followed by a tank-mix of Atlantis WG and pendimethalin, along with our adjuvant biopower. It should be applied early in the autumn to small, actively-growing weeds,

For the treatment of bromes, it can be followed by Pacifica and biopower in the spring (after 1stFebruary), up to the early tillering of the brome. For winter barley, Liberator can also be used in a programme with a pinoxaden-based product in the early autumn.

In situations where further residual control is required you may use ‘stacking’ - tank-mixing additional products including:

  • FPU (only on winter wheat)
  • DFF
  • Prosulfocarb (only on winter wheat)

See the tank mix for further information.


Liberator Product Summary

 Active substances (concentration) Flufenacet (400g/L) + diflufenican (100g/L)
Mode of action Flufenacet: Inhibition of cell division
HRAC Resistance Group K3
Diflufenican: Inhibition of carotenoid synthesis (bleacher)
HRAC Resistance Group F1
Formulation SC (Suspension Concentrate) - off white in colour
Crops All varieties of winter wheat and winter barley
Label application rate and maximum individual dose 0.6 L/ha
Active delivered at 0.6 L/ha 240g/ha flufenacet + 60g/ha diflufenican
Maximum number of treatments Two per crop
Latest time of application

Winter wheat: Pre-emergence to before GS 23
Winter barley: Pre-emergence to before GS 24

For latest calendar dates see label.

LERAP Category B
Pack size 5 L
MAPP number 15206

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