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Group 2 & 14


New, effective control of broadleaf weeds in a pre-seed application to start the season with cleaner fields. 

  • Post-emergence burndown of emerged weeds and residual pre-emergence control of secondary flushes of volunteer canola prior to seeding wheat and barley
  • Control of tough winter annual and perennial weeds like narrow-leaved hawk’s beard, dandelion and Canada thistle
  • Burndown control of resistant broadleaf weeds, including biotypes of kochia resistant to Group 2, 4 and 9

Labels & SDS


Labels & SDS

Additional Resources



Benefits of Smoulder

  • Smoulder provides post-emergence burndown control of broadleaf weeds.
  • Smoulder provides residual pre-emergence control of secondary flushes of volunteer canola.
  • Smoulder contains Group 2 and Group 14 ingredients to provide modes of action for effective control of many weeds, including resistant weeds.

Performance Trials


Improved residual volunteer canola, 22-50 DAT

Chart Volunteer Canola: Heat WG + Express Pro Herbicide + PrePass Herbicide + Smoulder

Enhanced annual burndown performance, 11-19 DAT

Chart: Express Pro + Prepass + Korrex II Herbicide + Smoulder

Perennial/winter annual weed control, 28-36 DAT

Chart: Heat WG + Express Pro + Prepass + Smoulder + Smoulder

Extended residual control of Roundup Ready® canola, 35 DAT

Field Comparison: Heat LQ herbicide + Smoulder

Product Info & Application Guide

Weed Management

Weed Class

Weeds Controlled1

Broadleaf weeds - 8-leaf stage (except where indicated)

Canada fleabane (15 cm)
Canada thistle1 (15 cm)
Cleavers (4 whorls)
Dandelion1 (15 cm maximum)
Kochia2 (15 cm)
Lamb's quarters
Narrow-leaved hawk's beard (8 cm)
Redroot pigweed
Round-leaved mallow
Volunteer canola3
Wild buckwheat
Wild mustard


1 When applied with glyphosate. It is recommended that Smoulder only be used when tank mixed with glyphosate.

2 Including biotypes resistant to Group 2, 4 and 9.

3 Provides control of secondary flushes (including Roundup Ready® and LibertyLink®) in addition to burndown control of volunteer canola (all types). 

Application Tips

Restricted entry interval - 12 hours.


Do not use on soils that have large gravelly or sandy areas, eroded knolls or calcium deposits.

Do not apply during periods of dead calm or gusty winds.


Pre-harvest interval

60 days when used as a pre-seed application. 



Wheat and barley forage may be used as feed (hay or sileage) or grazed 30 or more days after application. 

When to Apply





Wheat (incl. durum, spring and winter)




How Much to Apply

One case of Smoulder herbicide treats 80 acres.



Application Rate

Barley and wheat

11 g/ac (28 g/ha)


11 g/ac (28 g/ha)


All Applications

Merge 200 to 400 ml/ac (0.5 to 1 L/ha)


Water Volume

Ground application  20 to 40 L/ac (5 to 10 gal/ac)


4 Post-harvest application is only to be used prior to seeding wheat, barley and oats. 

Tank Mixes

Mixing Order

  1. Use a 50-mesh filter screen and fill clean spray tank 1/2 full of water. Start agitation system.
  2. Add the required amount of Smoulder herbicide and continue agitation until completely dissolved and product is fully dispersed.
  3. Add in glyphosate.
  4. Add the required amount of Merge adjuvant.
  5. Continue agitation while adding the remaining amount of water to fill the tank.
  6. Continue to agitate or the run the by-pass system.
  7. After any break in sprayer operation, agitate thoroughly before spraying again.


Sprayer Cleanout Instructions

  1. Immediately after spraying, completely drain the spray tank.
  2. Perform a thorough triple rinse following the procedure listed on the product label, box or technical.
  3. Use a commercial tank cleaner or household ammonia (minimum 3%) solution.


Tank Mixes

Glyphosate only.

Follow Crops

24 hours after pre-seed application.

Barley, wheat (durum, spring and winter)


11 months after application

Canola (all types), faba beans, field corn, flax5, Clearfield® lentils, peas, soybeans


Following season after post-harvest application

Oats, spring barley, wheat (spring or durum)


5 Flax may only be seeded 11 months after application in Black and Dark Brown soil zones. In the Brown soil zone, flax may be seeded 22 months after application.