Curtail™ M is a proven in-crop herbicide with control of Canada thistle 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, one drum treats 140-187 acres (contact local retailer to special order drums)
Application:  Low rate of 0.6 L/acre controls small weeds and lighter infestations. High rate of 0.8 L/acre controls larger weeds and heavier infestations.
Crop staging:  Wheat: 3-leaf – just before flag leaf. Flax: 5 cm – 15 cm in height

Registered crops

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

Weeds controlled

  • Buckwheat (wild, tartary)
  • Canada thistle
  • Dandelion (top growth)
  • Lamb’s-quarters
  • Redroot pigweed
  • Scentless chamomile
  • Shepherd’s-purse
  • Sow-thistle (annual, perennial)
  • Stinkweed
  • Volunteer canola
  • Volunteer sunflower
  • Wild mustard


  • EFFECTIVE systemic activity of two active ingredients that moves down to the roots of the weeds
  • COMPATIBLE with most graminicides to provide excellent weed control including tank-mixes with Signal®, Axial® Xtreme, Simplicityand many others
  • BROAD-SPECTRUM activity on many hard-to-control broadleaf weeds including pigweed and volunteer canola
  • BEST OPTION for flax crops with hard-to-kill weeds
  • The best above and below ground systemic 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.

Tank-mix partners


  • Axial
  • Axial Xtreme
  • Broadband*
  • Epic
  • Nufarm Tralkoxydim


  • Altitude FX2 (Clearfield® wheat)
  • Signal
  • Everest*
  • Simplicity
  • Traxos
  • Varro*


  • Poast
  • Select/Centurion
  • Statue

*not including durum
†600 mL/acre rate of Curtail M

For specific crop usage information see label for details