wheat ears at flowering stage



Trezac™ is a new broad-leaved weed herbicide for cereals, based on ARYLEX™ active together with aminopyralid.

Trezac™ can be used in winter cereals (wheat, spelt, barley, rye and triticale, and spring cereals (wheat, durum wheat, and barley), including crops grown for seed, milling and malting.


For more info call our Technical hotline:  0800 689 8899 or e-mail: ukhotline@corteva.com

About Trezac™


  • Provides broad spectrum weed control irrespective of the weather or weed growth pattern – if you can travel it will work
  • Market leading control of poppy
  • Control of ALS / SU resistant poppy
  • No cultivations required before sowing most crops
  • Contains two non-ALS mode of actions 


  • Barley
    Barley, Spring
    Barley, Winter

  • Rye

  • Spelt

  • Triticale

  • Wheat
    Wheat, Durum (Triticum durum)
    Wheat, Spring
    Winter Wheat

Technical Specifications

Product Registration Number:
MAPP 18253

Active Ingredient:
31.3 g/litre Arylex +  25 g/L aminopyralid

Pack Size:
1.0 Litre

Emulsifiable Concentrate

Maximum Individual Dose:
0.2 L/ha

Maximum Total Dose:
0.2 L/ha

Application Timing:
Winter Cereals
After 1st March
(GS 13-32)
Spring cereals
Between 1st March and 31st May
(GS 13-32)

Water Volumes:
100-400 Litres water/ha.

Spray Quality:
MEDIUM as defined by BCPC

All nozzle types

Buffer Zone:
5m reducible buffer zone
(1m for dry ditches)

30 minutes

Straw Management & Stewardship

  • Trezac must not be used on cereal crops where the straw is intended for animal feed, fodder or bedding. Nor for composting or mulching.
  • Trezac must only be used on cereal crops where the straw is to be incorporated back into the soil and will not leave the farm.



  • Agronomy software will alert to straw restriction
  • Label clearly states no straw removal


‘‘®™Trademarks of Corteva Agriscience and its affiliated companies. Use plant protection products safely. Always read the label and product information before use.