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PrePass™ XC

Only PrePass XC delivers SoilActive™ control for 21 days, guaranteed. For excellent control of a wide range of tough weeds including volunteer canola. Nothing hits harder or lasts longer.



  • Save time. Reduce your spring workload.
  • Hits harder. Superior control of winter annuals and broadleaf weeds in barley, oats, durum wheat and spring wheat.
  • Lasts longer. Apply any time before freeze-up this fall and you’ll see 21 days of SoilActive weed control next spring, guaranteed.
  • Flexibility. Exceptional control under variable weather conditions and application timing.
  • Multi-modes of action. Two active ingredients deliver overlapping control of key weeds for superior resistance management.
  • Rainfast. In 30 minutes – guaranteed.
  • Full service. Guaranteed by Dow AgroSciences.


Apply PrePass anytime from harvest until freeze-up for superior control of broadleaf weeds and winter annuals, including: volunteer canola, dandelion, narrow-leaved hawk’s-beard, cleavers, buckwheat, chickweed, stinkweed and more. You’ll get 21 days of SoilActive control – starting this fall, and lasting into next spring.


Cold soil conditions in the fall slow down and eventually stop the breakdown of the SoilActive component in PrePass. As soil warms up again in the spring, PrePass re-activates to begin controlling susceptible weeds again. Fields in which PrePass is applied in late September or October can stay clear of broadleaf weeds through April and even May – allowing you to seed earlier into clean fields

Grower Experience

We've used PrePass for pre-seed burn down exclusively over past couple of years and have been very pleased with results. There is very good residual control well into our post emergence weed spraying and the dandelion control has been excellent.

Russell H. - Cudworth, SK

Awesome stuff that PrePass.

Doug D. - Langham, SK

We used PrePass this year. It was the first year we ever tried it, and we are incredibly pleased with the results! It smoked the volunteer canola. We will definitely use it again next year.

Gerry P. - Rose Valley, SK

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Prepass XC logo


Weeds controlled

  • Annual blue grass3
  • Annual sow thistle3
  • Canada fleabane
  • Canada thistle3
  • Canola (all varieties)
  • Chickweed
  • Cleavers
  • Crabgrass3
  • Dandelion1
  • Downy brome
  • Flixweed
  • Foxtail barley3
  • Giant foxtail
  • Green foxtail
  • Hemp nettle
  • Kochia
  • Lady’s thumb
  • Lamb’s quarters
  • Narrow-leavedhawksbeard
  • Narrow-leaved vetch3
  • Persian darnel
  • Prickly lettuce3
  • Quackgrass3
  • Ragweed
  • Redroot pigweed
  • Russian thistle
  • Scentless chamomile
  • Shepherd’s purse
  • Smartweed
  • Stinkweed
  • Toadflax3
  • Volunteer barley
  • Volunteer flax
  • Volunteer wheat
  • Wild buckwheat
  • Wild mustard
  • Wild oats
  • Weeds Suppressed
  • Annual sow thistle
  • Perennial sow thistle
  • Spring and fall SoilActiveTM extended control
  • Canada fleabane
  • Canola (except Clearfield®)
  • Chickweed2
  • Cleavers2
  • Common ragweed
  • Dandelion seedling
  • Flixweed
  • Hemp nettle2
  • Lady’s thumb
  • Lamb’s quarters
  • Narrow-leaved hawksbeard
  • Redroot pigweed
  • Russian thistle
  • Scentless chamomile
  • Shepherd’s purse
  • Smartweed
  • Stinkweed
  • Volunteer flax
  • Wild buckwheat
  • Wild mustard

1 Seedling, over-wintered rosettes, mature plants up to 30 cm in diameter
2 PrePass XC will not provide extended control of ALS resistant broadleaf weeds
3 With the addition of glyphosate. Refer to the label for rates.

Winter Wheat


Winter annual weeds like narrow-leaved hawk’s-beard, flixweed, cleavers and shepherd’s-purse are hard to control in the spring with glyphosate alone, because they are too big. A fall PrePass application is the best way to control these winter annual weeds.

Winter Wheat Info Graphic

Crops & Crop Rotation


After fall or spring application, fields can be seeded to:

  • Barley
  • Durum wheat
  • Oats
  • Spring wheat
  • Winter Wheat

Fields may be seeded to any crop the spring
following a chemfallow application (prior to August 1st).

Crop rotations

Seed to barley, oats, wheat or summerfallow in the year of application.
The year following an August 1st or earlier application, seed to barley, wheat, oats, canola, field peas or summerfallow.


  • 40 ac/case
  • 1,200 ac/pallet or tote package
  • Water volume
  • – Ground 20-40 L/ac (5-10 US gal/ac)
    – Aerial not registered

When to Apply


  • Prior to seeding
  • No later than 48 hours after seeding, prior to any crop emergence
  • Chemfallow
    • When weeds are actively growing, in 1 to 4 leaf stage
  • Fall
    • From late September to freeze-up (after October 1st in southern regions)


30 minutes

Tank Mixes and Mixing Instructions

Tank Mixes

  • Vantage™ Plus MAX II
  • Maverick III

Mixing instructions
1. Fill the spray tank with 1/2 to 3/4 of the required amount of water.
2. Continue agitation throughout the mixing and spraying procedure.
3. Add the required amount of PrePass XC A.
4. Add the required amount of PrePass XC B.
5. Complete filling the sprayer tank with water.
NOTE: Do not mix undiluted herbicides in the chem-handler.

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.