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Tundra Herbicide Bayer CropScience



Rule with an Iron Fist

Protect your crop from weed invaders. Confidently clean your barley and wheat fields with the powerful, all-in-one, grass and broadleaf weed control of Tundra® herbicide.

Tundra controls the majority of grass weeds including wild oats, foxtail, barnyard grass and troublesome broadleaf weeds such as Group 2-resistant kochia, cleavers, chickweed and glyphosate-resistant kochia.

Tundra contains three different modes of action (Groups 27, 6 and 1) for sound broadleaf resistance management and superior efficacy. Its pre-mixed formulation simplifies your tank-mix orders, calculations and mix ratios making sure you have the quickest, most reliable performance possible.

See to it that your uninvited guests receive the royal treatment. Tundra herbicide is the complete solution for barley and wheat growers. One for all, and all-in-one.

Product Summary


Product Type

  • Herbicide


  • Barley
  • Wheat


  • Broadleaf & Grass Weeds
Weeds Surpressed

Weeds Controlled (Top 6)

  • Barnyard Grass
  • Green Foxtail
  • Wild Oats
Groups and Active Ingredients

Groups and Active Ingredients

  • Bromoxynil Group 6
  • Fenoxaprop-p-ethyl Group 1
  • Pyrasulfotole Group 27
Formulation Type

Formulation Type

  • Liquid-emulsifiable Concentrate


  • 8.1 L Jug (10 ac)
  • 129.6 L Bulk Shuttle (160 ac)
  • 405 L Bulk Tote (500 ac)

Key Product Points

  • Contains three different modes of action (Groups 27, 6 and 1) for confidence in achieving clean barley and wheat fields.
  • Its pre-mixed formulation ensures you have the quickest, most reliable performance possible, going from field-to-field without changing chemistry.
% Control of Wild Oats

Product Rate (L/ac.) Full Label Rates % Control
Tundra + AMS 0.81 + 0.51 92

Traxos™ + Infinity®

0.49 + 0.34 92

Axial® + Adigor® + Frontline™ XL

0.24 + 0.28 + 0.51 93

Axial + Adigor + Stellar™A+B

0.24 + 0.28 + 0.41 + 0.24 93

Traxos + Pulsar®

0.49 + 0.36 89
  Source: Bayer R&D trials 2011, n=5


Tundra vs. the Competition

See how Tundra stacks up against its competitors.

Tundra VS. Competition: Wild Oat Control


Active Ingredients

Pyrasulfotole – Group 27
Fenoxaprop-p-ethyl – Group 1
Bromoxynil – Group 6


Wheat, durum
Wheat, spring

Weeds Controlled

Grass Weeds
Barnyard grass
Green foxtail
Wild oats
Yellow foxtail

Broadleaf Weeds
Annual sow thistle
Canada fleabane (with AMS)
Common ragweed
Narrow-leaved hawk’s-beard
Pale smartweed
Redroot pigweed
Russian thistle
Shepherd's purse
Storks-bill (with 2,4-D)
Volunteer canola
Wild buckwheat
Wild mustard

Weeds Suppressed

Broadleaf Weeds
Canada thistle
Giant ragweed (with AMS)
Perennial sow thistle
Round-leaved mallow
Spreading atriplex

Province of Registration

British Columbia

Approved Tank Mixes

  • 2,4-D Ester1
  • AMS
  • Decis® (durum or spring wheat)
  • Lontrel
  • MCPA Ester1
  • Sevin XLR
  • Tilt®(spring wheat only)

jug icon

Get the Max from your Tank Mix

Our tank mix tool can help you find the best tank mix partner for the Bayer herbicide you’re using.
Tank Mix Tool


The addition of MCPA Ester and AMS to Tundra provides you with up to 17% greater Canada Thistle suppression as highlighted by the chart below.

Increase in Canada Thistle Suppression with addition of MCPA Ester

Tundra Suppression Chart

Source: 5 internal Bayer trials

1 The addition of MCPA or 2,4-D ester may result in reduced grass control under drought conditions, heavy grass populations or advanced grass stages and therefore should be limited to a maximum of 4 active ounces/acre.

No Tank Mixing

Skip The Fuss With Tundra

There’s a faster way to get into the field with pre-mixed Tundra® herbicide for both grassy and broadleaf weeds: All-in-one

  • No tank-mixing
  • Less calculation errors
  • Maximize productivity

Application Guidelines


  • Fast and effective – Provides quick and noticeable results
  • Comprehensive control – Controls the majority of grassy and broadleaf weeds on your farm including Group 2-resistant broadleaf weeds (like kochia, cleavers and chickweed) and Group 9 –resistant kochia.
  • Broadleaf resistance management – Contains an innovative Group 27 herbicide, a key broadleaf resistance management tool
  • Crop safe – Tundra includes a Bayer proprietary safener, making it exceptionally safe for use in barley, durum and spring wheat
  • Easy to use – Don’t fuss with tank mixing order, the hassles, calculations and potential errors that are associated with tank mixing; just add water and go. With this pre-mixed formulation comes the ability to reduce errors, capitalize on the small window of time that you have, increase efficiency and be more productive.
  • Wide window of application – Good from 1 to 6 leaves on the main stem up to emergence of the third tiller on the crop
  • Registered for both ground and aerial application
  • Allows you to move from barley to wheat without stopping


Application Tips

  • Just add water and go
  • Fill sprayer tank ¼ to ½ full with clean water and add Tundra herbicide. Fill the spray tank with balance of water as required.
  • If adding AMS, always add AMS to the tank first
  • When adding AMS to Tundra, do not include a fungicide tank mix


0.81 L/acre


  • Apply Tundra from the 1 to 6 leaf stage on the main stem plus 3 tillers on barley, durum wheat and spring wheat
  • Do not apply to a crop that is stressed by severe weather conditions, frost, low fertility, drought, water-saturated soil, disease or insect damage as crop injury may result
  • Do not apply to crops under sown with legume species


  • 8.1 L jug = 10 acres (one 2 x 8.1 L case = 20 acres)
  • 129.6 L Bulk shuttle = 160 acres
  • 405 L Bulk tote = 500 acres


Water Volume
  • Ground – minimum of 5 US gal./ac. (19 L/ac.)
  • Aerial – minimum of 3 US gal./ac. (11 L/ac.)


One hour after application


Residue and Grazing

Do not:

  • harvest for grain within 65 days of application.
  • graze the treated crops or cut for forage or hay within 25 days of application.
  • re-enter treated fields within 12 hours of application.


Re-cropping Intervals
  • Alfalfa, barley (spring), canary seed, canola, corn (field)1, flax, oats, peas (field)2, potatoes, soybeans1, sunflowers, wheat (durum and spring) can be planted 10 months following an application of Tundra.
  • Lentils can be planted 22 months following an application of Tundra.

1Manitoba only.
2Field peas may be grown the year following a Tundra herbicide application in all black, grey-wooded and dark brown soil zones. Do not plant field peas the year following a Tundra application in brown soil zones where organic matter content is below 2.5% and soil pH is above 7.5.



What is Tundra®?

  • Tundra is an all-in-one grassy and broad-spectrum broadleaf herbicide

What active ingredients are in Tundra?

  • Tundra contains three active ingredients:
    1. Pyrasulfotole (Group 27)
    2. Bromoxynil (Group 6)
    3. Fenoxaprop-p-ethyl (Group 1)

Can I apply Tundra to my barley?

  • Tundra is registered for use in spring wheat (including durum) and barley.

What makes Tundra convenient?

  • No tank-mixing of separate grass and broadleaf cocktails, no tank-mix order to look up, 160 ac./drum (no metering/measuring), or 500 ac./tote, quicker than triple rinsing jugs, just add water and go!

Do I need to tank-mix an adjuvant or additional broadleaf herbicide with Tundra?

  • No adjuvant, surfactant or additional herbicide is required with Tundra.

Why did Bayer develop an all-in-one product?

  • Farmers told us that during the hectic spraying season they don’t have time to fuss with the calculations, rates, hassles and potential errors associated with tank-mixing, they wanted a simple solution to control the majority of the weeds on their farm.

What weeds will Tundra control?

  • Tundra will control barnyard grass, green foxtail, wild oats, yellow foxtail, annual sow thistle, chickweed, cleavers, common ragweed, flixweed, hemp-nettle, kochia, lamb’s-quarters, pale smartweed, redroot pigweed, Russian thistle, shepherd’s-purse, stinkweed, volunteer canola (including conventional, Round-up Ready, Liberty Link and Clearfield), wild buckwheat, wild mustard and suppression of Canada thistle, dandelion, perennial sow thistle, and round-leaved mallow.
  • Tundra has NEW weed registrations for Canada Fleabane, Giant Ragweed, Narrow-leaved Hawk’s Beard, Stork’s-Bill

Will Tundra control my Group 2-resistant kochia, chickweed and cleavers?

  • Tundra contains a new mode of action (pyrasulfotole), which is the only Group 27 in cereals and will control your Group 2 herbicide-resistant weeds such as kochia, cleavers, chickweed and spiny annual sow thistle. In addition, Tundra will also control your Group 9 or glyphosate resistant weeds like kochia

Can I add Ammonium Sulphate (AMS) to enhance control of cleavers?

  • Bayer recommends adding AMS Utility Modifier with Tundra for control of cleavers that are in the 4 to 6 whorl stage. If adding AMS, always add AMS to the tank first.

How much Bayer AMS Utility Modifier should I add to Tundra?

  • Bayer’s AMS Utility Modifier has a concentration of 400 g/L (40% solution) and a label rate of 500 g/ha, therefore AMS should be added at a rate of 0.5 L per acre (20 acres per jug). Add one 10 L jug of AMS for 2 X 8.1 L jugs of Tundra.

At what crop stage can Tundra be applied to the registered crops?

  • Apply Tundra from the 1 to 6 leaf stage on the main stem plus 3 tillers on barley, durum wheat and spring wheat.

What is the rainfast rating for Tundra?

  • One hour.

How much water should I use when applying Tundra by ground & air?

  • Ground application - minimum of 5 US gal./ac. (19 L/ac.)
  • Air - minimum of 3 US gal./ac. (11 L/ac.)

Bayer recommends using more water to achieve better coverage when applying the product in dense crop canopies, on high weed populations or on advanced growth stage weeds.

How many acres does one jug treat?

  • One 8.1 L jug treats 10 acres (2 X 8.1 L case will treat 20 acres).
  • One 129.6 L BigBoys shuttle treats 160 acres and one 405 L BigBoys tote treats 500 acres.

What crops can be grown the year after an application of Tundra?

  • Alfalfa, barley (spring), canary seed, canola, corn (field)1, flax, oats, peas (field)2, potatoes, soybeans1, sunflowers and wheat (spring and durum) can be planted 10 months following an application of Tundra. Lentils can be planted back 22 months following an application of Tundra.

1MB only

2Field peas may be grown the year following a Tundra herbicide application in all black, grey-wooded and dark brown soil zones. Do not plant field peas the year following a Tundra application in the Brown soil zone where organic matter content is below 2.5% and where soil pH is above 7.5%.

Can I add MCPA or 2,4-D to Tundra?

  • Yes, up to a maximum of 4 active ounces per acre of MCPA for enhanced suppression of Canada Thistle and a maximum of 4 active ounces per acre of 2,4-D for control of stork’s-bill.

Can I tank-mix a fungicide with Tundra?

  • Tilt® can be tank-mixed with Tundra on spring wheat and barley. If adding AMS to Tundra for enhanced weed control, do not tank-mix with a fungicide. For a list of unlabelled tank mixes supported by Bayer, please visit: Tank Mix List

Grower Testimonials

I was looking for something better for wild oat and broadleaf weed control in barley. The main weed problems are wild oats, Russian thistle and kochia. The wild oat control was good, and it seems to be very sharp on kochia and Russian thistle which is what we have been looking for. Group 2-resistance is a concern, and that’s why we mix up our crop rotations and chemical groups. If the weather is against us, Tundra’s wide window of application gives us a bit more time. I didn’t have any problems at all with crop safety, and it was simple to use. There’s only one product to put in the tank so it speeds up the operation, and we have no tank mix issues. I was pleased with the overall result and plan to use it again on barley.

- Mike Carr, Purdue SK

We sprayed Tundra last year on 40 acres of barley in the three to four leaf stage to control wild oats, wild buckwheat and lamb’s-quarters. The weed control was excellent and crop safety was very good. We couldn’t find any weeds after spraying. Not having to tank mix is definitely a benefit, and there is less exposure to the chemistry. We plan to spray 300 to 400 acres of barley with Tundra this year.

- Jonathon Wollmann, Clearwater Colony, Balmoral MB

I wanted to see how Tundra compared to other products for wild oat control so I tried it on 40 acres of wheat. I sprayed when the crop was in the three to four leaf stage, and I was pleased with its performance on both wild oats and the broadleaf weeds. It was safe on the crop. We had some rain not long after spraying and it still performed well. Because it’s an all-in-one product, it’s easy to use and I plan to use it again.

- Laramie Eyben, Vermilon AB

When it comes to weed control, three tough weeds – hemp-nettle, cleavers and wild buckwheat – narrow our product options. If you haven’t controlled the cleavers, it can be a nightmare to swath at harvest time. We tried Tundra on 40 acres of feed barley and I didn’t see any cleavers when we swathed. We were also pleased with crop safety. We were worried the crop was getting too far along when we sprayed, but we saw no colour change with the rest of the field. Tundra gives you the most bang for your buck. It’s priced competitively, easy to apply, crop safe and has a decent wild oat window. It can’t get much easier than having all your product in one container, so it’s a pretty easy decision to use Tundra.

- Doug Winkler, Indus AB

I used Tundra on some CPS wheat at the four to six leaf stage and I was really happy with the performance. There weren’t any issues with crop safety. It comes in one jug, so it’s easier than tank mixing, especially if you have a lot of acres to cover. We plan to spray about 400 acres of wheat with it this spring.

- Mike Montgomery, Dapp AB

We sprayed Tundra when the crop was in the three to four leaf stage and it was excellent on the thistle, it yellowed them off and provided good season-long control. I was surprised how fast it worked, even on the wild oats. I do all the spraying myself so the wide window of application gives me more flexibility. Performance was excellent. I didn’t have any escapes. We had left a check strip and it had significant weed infestation. Crop safety was great with no difference between the 40 acre plot and the rest of the field. Because Tundra is an all-in-one jug, it’s nice not to have to tank mix. I plan to use it again.

- Dallas Clarke, Virden MB

Tundra performed very well for us on both grassy and broadleaf weeds including sow thistle. We sprayed 40 acres of barley at the three to four leaf stage and the crop safety was very good. The large weed spectrum that it covers and its wide window of application are both key benefits. Also, Tundra is very user-friendly, it mixes well and it's in one jug. For me that's appealing. Another bonus is that Tundra contains a different group of chemistry.

- Rick Poirer, Antler SK

We sprayed Tundra on 40 acre of barley at around the four leaf stage. The wide window of application gives us flexibility which is important. I was happy with the product performance and crop safety. We couldn’t see a difference between the 40 acre plot and the rest of the field. Having one product to control both broadleaf and grassy weeds is very important. That’s just one less thing to worry about. It’s a bonus that you don’t have to tank mix.

- Mark Slade, Tisdale SK

We tried Tundra on some hard red spring wheat. We’d had hail on that canola field the year before and volunteer canola was our worst weed problem. Tundra did a very good job of controlling all the weeds for us. We like to spray early but you never know with the weather, so the wide window of application is a nice feature. Using one product to control both broadleaf and grassy weeds is appealing – the less there is to handle the better off we are.

- Leo Gignac, Albertville SK

We tried Tundra on 40 acres of barley to control wild oats and some broadleaf weeds including thistles and wild buckwheat. It worked extremely well, was convenient to use and was very crop safe. You can get caught up in some situations where things just don’t go as planned, so the wide application window is a key benefit.

- Chris Kulbacki, Neepawa MB

Resistance Management

Group 27

The unique Group 27 active in Tundra gives you another tool to manage resistance. With only three Group 27 herbicides on the market, you can be sure you are getting a powerful herbicide and a superb rotational tool to knock out the toughest resistant weeds in your field.

Tundra herbicide – Dead simple

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.

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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