Control problem grass and broadleaf weeds in wheat – with the tougher, easier, total-acre solution.


  • Tougher. Control of chickweed, cleavers, hemp-nettle, Japanese brome, kochia, wild buckwheat and much more.
  • Easy to use. Control all problem weeds using one solution.
  • Flexible. Wide window of application, excellent crop safety, flexible rate and rotational freedom.
  • Multi-mode of action. Two unique modes of action provide overlapping activity on hard-to-kill weeds for superior resistance management.

Grower Experience

This option is very good for us, with the large amount of acres we have to cover - that one pass suits us very well. Once we get it done we know we can move on to the next stuff.

Bryce C. - Hamiota, MB

One pass control on Group 1 wild oats and Group 2 cleavers, also tank mix options for thistles.

Byron S. - Kinistino, SK

We used Tandem on our wheat this year. It worked good on all weeds. We liked it especially for its two modes of action as resistant weeds are becoming more and more of an issue.

Jeff K. - Annaheim, SK

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Weeds controlled

- Grass
  • Barnyard grass
  • Japanese brome
  • Wild buckwheat
  • Wild oats1
  • Yellow foxtail
  • Canada thistle
  • Chickweed2
  • Cleavers2
  • Corn spurry
  • Cow cockle
  • Flixweed
  • Kochia2
  • Lady’s thumb
  • Redroot pigweed
  • Round-leaved mallow
  • Russian thistle
  • Sheperd's purse
  • Smartweed
  • Stinkweed
  • Volunteer canola (all varieties)
  • Volunteer flax


Additional broadleaf weeds controlled when tank mixed with 2,4-D (5 oz/ac)
  • Bluebur
  • Burdock
  • Cocklebur
  • Goat’s beard
  • Lamb’s quarters
  • Plantain
  • Prickly lettuce
  • Ragweed
  • Sweet clover
  • Volunteer sunflower
  • Wild mustard
  • Wild radish
  • Wild buckwheat


Additional broadleaf weeds controlled when tank mixed with MCPA (5 oz/ac)
  • Burdock
  • Cocklebur
  • Lamb’s quarters
  • Prickly lettuce
  • Ragweed
  • Vetch
  • Volunteer sunflower
  • Wild buckwheat
  • Wild mustard
  • Wild radish


Weeds Suppressed Grass
  • Green foxtail3
  • Downy brome4
Weeds Suppressed Broadleaf
  • Dandelion4
  • Hemp-nettle
  • Stork's-bill

1 Including Group 1 resistant biotypes
2 Including Group 2 resistant biotypes
3 Dow AgroSciences research trials indicate that application to small stage, actively growing plants provides an increased level of control
4 Spring rosettes
5 Top growth only

Crops & Crop Rotation


  • Durum wheat
  • Spring wheat
  • Winter wheat

Crop rotations

Seed to all major crops the year following application – including peas, lentils and chickpeas.


  • 40 ac/case to 53 ac/case
  • Water volume

– Ground 40 L/ac (10 US gal/ac)

– Aerial 40 L/ac (10 US gal/ac)


​53 ac/case rate available for use in low to moderate wild oat levels that are typical in the brown soil zones.

When to Apply

  • Crop stage: 3 leaf to prior to flag leaf emergence
  • Weed stage:

– 1 to 6 leaf stage of wild oats

– 1 to 5 leaf stage of broadleaf weeds


2 hours

Tank Mixes and Mixing Instructions

Tank mixes

  • MCPA
  • 2,4-D
  • CurtailTM M


Mixing instructions

  1. Fill the spray tank with ½ to ¾ of the required amount of water
  2. Continue agitation throughout the mixing and spraying procedure
  3. Add required water conditioner
  4. Add any tank-mix partners that are a dry formulation
  5. Add the required amount of Tandem A
  6. Add the required amount of Tandem B
  7. Add the required amount of broadleaf tank-mix partner
  8. Add any required adjuvant or surfactants
  9. Complete filling the sprayer tank with water

Note: Do not mix undiluted herbicides in the chem-handler

Grazing & Harvest

  • Livestock may graze treated areas 7 days after application.
  • Allow 7 days after application before grazing lactating animals.
  • Withdraw meat animals from treated areas at least 3 days before slaughter.
  • Allow 30 days after application before cutting hay or harvesting forage.
  • Mature crops may be harvested 60 days after application.

Performance Inquiry Guidelines

Dow AgroSciences encourages contact within the timelines listed for proper field assessments to resolve and rectify the call.

After these deadlines, it is difficult to determine the circumstances leading to non-performance.

  Days After Use
Seed Within 21 days (after crop emergence)
Pre-emergent herbicides Within 21 days (after crop emergence)
Post emergent herbicides Within 21 days after treatment
Pre-seed herbicides Within 21 days after treatment
Pre-harvest or post harvest Within 21 days after seeding – the following spring
Fallow applications Within 21 days after treatment
Fungicides 7 days after treatment
Insecticides 7 days after treatment

* Check Strips: while not essential, a check strip provides a good indication of product performance.

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