Curtail M


Curtail™ M herbicide provides excellent in-crop systemic action that kills roots of Canada thistle and other perennial weeds like sow thistle and dandelion in cereals, flax, and canary seed.

Technical Information

Active ingredient: Group 4 (clopyralid + MCPA ester)
Rainfast: 4 hours
Treatment rate: One case treats 20-27 acres
Application: Low rate of 0.6 L/ac. controls small weeds and lighter broadleaf weed infestations. High rate of 0.8 L/ac. controls larger weeds and heavier infestations
Crop staging: Wheat – 3-leaf to flag leaf. Flax – 5 cm to 15 cm in height

Control Tough Weeds

Buckwheat (wild, tartary)Shepherd’s-purse
Canada thistleSow thistle (annual, perennial)
Dandelion (top growth in spring)Stinkweed
Lamb’s-quartersVolunteer canola
Redroot pigweedVolunteer sunflower
Scentless chamomileWild mustard 

Registered Crops

  • Barley
  • Canary seed
  • Flax
  • Oats
  • Spring wheat (including durum)
  • Timothy


  • GET TO THE ROOT OF THE PROBLEM with effective systemic activity of two active ingredients that get right down to the root
  • COMPATIBLE with most graminicides to provide excellent weed control including tank mixes with Signal®, Axial® Xtreme, Simplicity™ and many others
  • BROAD SPECTRUM ACTIVITY on many hard-to-control broadleaf weeds including pigweed and volunteer canola
  • BEST OPTION for hard-to-kill weeds in flax


  • The best above- and below-ground systemic Canada thistle control
  • Makes harvest easier
  • Delivers in-crop yield protection

Weed Control Challenge

Cereal yield and quality losses from Canada thistle

Canada thistle and sow thistle deliver aggressive in-crop problems for many growers. Capable of producing 14 shoots per square metre, and a root system that extends for 20 feet, Canada thistle can reduce cereal yields by up to 38%* and significantly affect crop quality.

*Manitoba Agriculture Food & Rural Initiatives – 2013

Nufarm Solution

Targeted to take out Canada thistle

Curtail M provides the best in-crop, systemic action with trusted Group 4 chemistry to kill the roots of Canada thistle and other troublesome perennial weeds such as sow thistle and dandelion. With two active ingredients, Curtail M translocates deep down to the extensive thistle roots for effective above- and below-ground control.

Tough Weeds in Cereal Crops

Supported Grass Tank Mix Partners

Wheat and BarleyWheat OnlyFlax
AssertAltitude FX2 (Clearfield wheat)Poast
Axial*Everest + AgSurf*Select/Centurion
Axial and Axial XtremeSignal 
Nufarm TralkoxydimVarro*+ 
*not including durum   +600 mL/ac. rate of Curtail M


For specific crop usage information see label for details