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Korrex™ II

Control all forms of resistant kochia plus get SoilActive technology to help control tough broadleaf weeds.


  • Kochia control. Superior pre-seed control of kochia, including glyphosate resistant biotypes.
  • Flexible mixing options. Easy tank mixing additive for any glyphosate.
  • Broad-spectrum broadleaf weed control. Including dandelion, narrow-leaved hawk’s-beard, wild buckwheat, flixweed, stinkweed, volunteer canola and more. Excellent solution for fall Canada thistle control.
  • SoilActive technology for extended broadleaf weed control
  • Effective solution for herbicide resistance management.


Korrex II tank mixed with glyphosate such as VP480, at ½ REL/ac provides effective pre-seed control of the following weeds:

Broadleaf weeds

  • Annual sow thistle2
  • Canada fleabane3
  • Chickweed
  • Cleavers
  • Cow cockle
  • Flixweed
  • Hemp-nettle
  • Kochia
  • Lady’s-thumb
  • Lamb’s-quarters
  • Narrow-leaved hawk’s-beard
  • Ragweed
  • Redroot pigweed
  • Russian thistle
  • Scentless chamomile​2
  • Shepherd’s purse
  • Smartweed
  • Stinkweed
  • Volunteer canola1
  • Volunteer flax
  • Wild buckwheat
  • Wild mustard

Annual grasses
  • Downy brome
  • Giant foxtail
  • Green foxtail
  • Persian darnel
  • Volunteer barley
  • Volunteer wheat
  • Wild oats

Perennial weeds
  • Dandelion (seedling, overwintered rosettes, mature plants up to 30 cm diameter)
  • Perennial sow thistle4

Korrex II tank mixed with glyphosate at 1.0-2.8 REL/ac also provides effective control of the following weeds:
  • Annual sow thistle
  • Canada thistle (rosette stage)
  • Quackgrass

1 Including all herbicide-tolerant canola varieties
2 Suppression only
3 Less than 8 cm in height
4 Applications made at advanced stages will reduce effectiveness

Crops & Crop Rotation

  • Barley
  • Durum wheat
  • Oats
  • Spring wheat
  • Winter wheat
Crop Rotation

The year following Korrex II application, fields can be rotated to barley, mustard, canola, chickpeas, corn, field beans, flax, lentils, peas, potatoes, soybeans, sunflower, wheat or summerfallow.


Rates and packaging:
Spring: 80 acres/case
Fall: 56 acres/case

When to Apply

Prior to seeding

No later than 48 hours after seeding, prior to crop emergence


30 minutes

Tank Mixes and Mixing Instructions

Tank mixes
  • VP480
  • Compatible with all forms of glyphosate

Mixing instructions
  1. Fill the spray tank with 1/2 full of water.
  2. Start sprayer tank agitation.
  3. Add the required amount of Korrex II A Herbicide, continue agitation.
  4. Add the required amount of Korrex II B Herbicide, continue agitation.
  5. Add the required amount of glyphosate, continue agitation.
  6. Fill the sprayer tank with sufficient water to spray 50-100 L of spray mixture per hectare.

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

Grazing & Harvest

  • Do no graze treated areas within seven days of application.
  • Do not harvest treated crop within 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.