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Buctril M Herbicide Bayer CropScience

Buctril M


The Trusted Name

Buctril M has set the standard for broadleaf herbicides for more than 40 years. As the most trusted and consistent broadleaf herbicide available to cereal, flax and corn growers, Buctril M continues to provide powerful, fast-acting control of more than 28 broadleaf weeds.

Buctril M is a versatile tank mix partner for many products, is easy to use and can be counted on for effective resistance management, containing Group 4 and Group 6 ingredients. This dual mode of action provides both systemic and contact activity on your broadleaf weeds.

Buctril M is Available in easy-to-use jugs, 320-acre Bulk shuttles or super convenient 1,000-acre Bulk totes.

Product Summary


Product Type

  • Herbicide




  • Broadleaf
Weeds Surpressed

Weeds Controlled (Top 6)

  • Kochia
  • Wild Buckwheat
  • Canada Thistle
Groups and Active Ingredients

Groups and Active Ingredients

  • Bromoxynil Group 6
  • MCPA Group 4
Formulation Type

Formulation Type

  • Liquid-Emulsifiable Concentrate


  • 8 L Jug (20 ac)
  • 128 L Bulk Shuttle (320 ac)
  • 400 L Bulk Tote (1,000 ac)

Key Product Points

  • Controls 29 different broadleafs with excellent crop safety.
  • With no confirmed resistance in Canada, Buctril M herbicide continues to stand the test of time.

Active Ingredients

Bromoxynil - Group 6
MCPA - Group 4


Canary Seed
Established Timothy
Fall Rye
Seedling Grasses
Wheat, durum
Wheat, spring
Wheat, winter

Weeds Controlled

American Nightshade
Ball mustard
Common buckwheat
Common groundsel
Common ragweed
Cow cockle
Green smartweed
Night-flowering catchfly
Pale smartweed
Redroot pigweed
Russian thistle
Scentless chamomile
Shepherd's purse
Tartary buckwheat
Volunteer canola
Volunteer sunflower
Wild buckwheat
Wild mustard
Wild tomato
Wormseed mustard

Weeds Suppressed

Canada thistle
Perennial sow thistle
Prickly lettuce

Provinces of Registration

British Columbia
New Brunswick
Northwest Territories
Nova Scotia
Prince Edward Island

Approved Tank Mixes

Liquid Achieve®
Puma® Advance
Refine® SG
Sevin® XLR

Get the Max from your Tank Mix

For a complete list of registered and Bayer supported tank mixes, please see: Tank Mix List

Application Guidelines


  • Controls 28 broadleaf weeds
  • Excellent crop safety
  • Registered for use on wheat, barley, oats, flax, corn, fall rye and seedling grasses
  • No re-cropping restrictions
  • Registered for aerial application
  • Tank mix with Varro® for even greater broadleaf weed control
  • Effective tank-mix partner with many grassy herbicides
  • Effective resistance management – contains Group 6 (bromoxynil) and Group 4 (MCPA) active ingredients
  • Dual modes of action provide both systemic and contact activity
  • Available in Bulk for added convenience


Application Tips

0.4 L/ac. (20 ac./jug)


Wheat (spring & durum), barley and oats From the 2 leaf stage until the early flag leaf stage
Winter wheat From the 2 to 4 leaf stage in the fall or from the time growth commences to the early flag leaf stage in the spring
Fall Rye From the time growth commences in the spring to early flag leaf stage
Flax From the time it is 5 cm high up to early flower bud stage (5 to 10 cm gives best results)
Corn From the 4 to 6 leaf stage
Canary From the 3 to 5 leaf stage
Seedling grasses From the 2 to 4 leaf stage (establishment year only)
(established grown for seed production)
Apply prior to shot blade in the seed production year
(established grown for hay)
From the 3 to 6 leaf stage


  • One 8 L jug = 20 acres (one 2 x 8 L case treats 40 acres)
  • 128 L Bulk shuttle = 320 acres
  • 400 L Bulk tote = 1,000 acres


Water Volume


  • Minimum of 5 US gal./ac. (20 L/ac.) in all crops except corn and seedling grasses
  • For corn, minimum of 21 US gal./ac. (80 L/ac.)
  • For seedling grasses, minimum of 16 US gal./ac. (61 L/ac.)


  • Minimum of 3 US gal./ac. (11 L/ac.)
  • Recommended minimum of 4 US gal./ac. (16 L/ac.) when there is a heavy crop canopy


  • One hour after application


Residue and Grazing
Do not graze or cut for forage hay until 30 days after spraying


Re-cropping Intervals
No re-cropping restrictions


Tips & Tricks

  • Fine to medium droplet size is important for optimum coverage
  • Use appropriate water volumes to maximize control; use flat fan nozzles (no raindrop or floodjet nozzles)
  • Travel at proper speeds (5 to 10 km/hr.)
  • Use proper pressure: 40 psi (275 kPa)
  • Do not spray flax in hot, humid weather when daytime temperatures exceed 28°C

Resistance Management

Resistance Management

Discover how Buctril® M herbicide and its Group 6 mode of action can help you manage costly and damaging herbicide-resistant weeds.

Buctril M herbicide – Group 6 has no known resistance in Western Canada

Buctril M has been a top-selling brand covering millions of acres for 50 years. Pre-dating the commercial release of glyphosate (Group 9) and many other chemistries, there have been no documented cases of resistance to Group 6, the active in Buctril M, in Western Canada.

  • Powerful control of 28 broadleaf weeds, including weeds with resistance
  • Group 4 and Group 6 active ingredients make Buctril M an effective resistance management tool
  • Dual mode of action provides both systemic and contact activity

What is Resistance?

Resistance is a naturally occuring, inherited ability of some weed biotypes to survive a herbicide treatment that should, under normal use conditions, effectively control a weed population. Some herbicide resistant weeds have naturally developed one or more mechanisms that allow them to survive a herbicide treatment.

For a weed to be considered resistant it must:

  • Normally be controlled by the herbicide
  • Survive a usually lethal dose of the herbicide
  • Be heritable, meaning it is passed from generation to generation

Herbicide-resistant individuals are naturally present within a weed population at very low frequencies.

Did you know that there is no known resistance to Group 6 herbicides in Western Canada?

What's the impact to farming in Western Canada?

Why is it important to you?

The management issues and yield concerns with herbicide resistance are very real, especially now with an increasing number of herbicide resistant weeds spreading across Western Canada.

Loss of viable herbicide options

  • Have to rely on currently available herbicides for the foreseeable future
  • No herbicides with new modes of action are in advanced trials

Would require changes in weed and crop management practices

  • Zero or reduced tillage rely heavily on herbicides for weed control

Reduced return on investment

  • Increase the cost of weed management
  • Loss of yield potential

The number of weeds with herbicide resistance continues to rise

  • Including weeds resistant to multiple modes of action

How does resistance develop?

The image below demonstrates the interaction between a weed species and a particular mode of action and the development of herbicide resistance at different speeds. It’s clear to see that over time the use of a herbicide quickly changes from being very effective to becoming extremely ineffectual. In fact, by the fifth year of application the herbicide is failing to eliminate herbicide-resistant weeds. It is particularly alarming that there is a dramatic increase in failure rate from the fourth to fifth season.

Development of Herbicide Resistance

% Resistant Weeds in Population Weed Control
0 Application .0001% Excellent
1st Application .00143% Excellent
2nd Application .0205% Excellent
3rd Application .294% Excellent
4th Application 4.22% Excellent
5th Application 60.5% Failure
Source: Weed Science Society of America, 2011

What can you do to delay the onset of herbicide resistance?

  • Don’t rely solely on herbicides for weed control
  • Develop field-specific long-term weed management plans
  • Rotate herbicide groups year over year

General guidelines for herbicide rotations:

  • Avoid repeated use of the same herbicide or herbicides having the same mode of action in the same field year to year
  • Limit the number of applications of a single herbicide or herbicides having the same site of action in a single growing season
  • Use mixtures or sequential treatments of herbicides having different modes of action which are active on the same target weeds whenever possible
  • Use non-selective herbicides pre-seed or pre-emergence to control early flushing weeds (prior to crop emergence) and/or weed escapes

Resistant weed management strategies

  2. Rotate crops as often as possible to utilize the unique modes of action available within the crop.

  4. Time and place fertilizer to benefit your crop, not weeds.

  6. Systematically target problem weeds and respond quickly to changing weed populations.

  8. Scout often and take note of individual weed response to all applications (pre-emergent, post-emergent and pre-harvest).

  10. Make sure you remove all weeds before they set seed – even if you have to pull by hand. Remember the old English proverb: One year seeding, seven years weeding.

  12. Leaving a 1m wide weed-free zone around your cropping fields (so new weeds can’t propagate and expand throughout your fields).

  14. Decrease your row spacing and increase seeding rates to optimize plant populations, maximize crop competitiveness and minimize time to crop canopy closure.

    • Match selection of herbicide(s) with your most difficult weeds.
    • Use full-labelled rates.
    • Include the best tank mixes and adjuvant(s).
    • Use correct spray volume (follow label directions).
    • Use correct nozzle spacing and droplet size.
    • Don’t spray at excess travel speeds, follow label directions.
    • Apply during the best weather conditions (warm, humid, and sunny conditions with minimal wind).
    • Maximize rain-fastness intervals.
    • Time of day (herbicides are most effective when sprayed between 8:00am and 9:00pm).

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