Alert icon You’ve been geo-located to Saskatchewan. Please ensure this is representative of where your farm resides. If not, please select the correct province. Sorry we cannot determine your location. To accurately serve you better, please choose your province below. Close icon

Select your preferred language.

Choisissez votre langue préférée




Trusted Protection With Proline

Costing canola growers an average 10% yield loss, or more depending on the severity of infection, sclerotinia can wreak havoc on growers' bottom lines. With this much to lose, you can count on the number one brand choice of canola growers in Canada – Proline® fungicide. More growers use Proline for reliable protection against sclerotinia than any other canola fungicide. Simply apply a timely application to your canola between 20 to 50% bloom stage and you've effectively reduced infection rates by up to 80%.

Product Summary


Product Type

  • Fungicide


Diseases Controlled

Diseases Controlled (Top 3)

Diseases Supressed

Diseases Suppressed (Top 3)

Groups and Active Ingredients

Groups and Active Ingredients

  • Prothioconazole Group 3
Formulation Type

Formulation Type

  • Suspension Concentrate


  • 5.1 L Jug = 40 ac.

Take a closer look at how Proline reduces sclerotinia infection:

Western Canada 6-Year Canola Results

Canola demonstration strip trial (DST) results over 6 years show that Proline will deliver an average yield increase of +3.7 bu./ac over the untreated check. In a high disease pressure situation that yield increase jumps to +5.9 bu./ac.

Western Canada 6-Year Canola Results

Canola Competitor Results Under High Sclerotinia Pressure

Both fungicide applications outperformed the untreated check, but Proline led the way under high disease pressure with a 7.6% yield increase.

Canola Competitor Results Under High Sclerotinia Pressure


Control Sclerotinia for exceptional yield performance

Sclerotinia can wreak havoc on your bottom line. Even more alarming? Sclerotinia can remain relatively undetected for long periods of time and once it becomes visible – it’s already too late.

Sclerotinia sclerotiorum

Sclerotinia infection in canola occurs primarily at flowering from air-borne ascospores which infect blossoms during periods of extended wetness.

Symptoms include:

  • Soft, watery rot
  • Premature ripening
  • Pale grey or white lesions on stems, branches, pods
  • Straw-coloured plants
  • Frequent lodging and shattering at swathing
  • Premature death and ripening, as if the crop was cut two weeks too early

Infection can result in:

  • Decreased yield potential
  • Death of plant before seed development
  • Uneven seed maturation
  • Under-developed seed pods
  • Reduced seed weight
  • Increased risk of losses in swath

The loss of crop by this disease is often overlooked. The economic implication of sclerotinia is significant when you do the math.

How to quantify your yield loss potential.

Want to calculate your potential ROI? Click here to use our Fungicide ROI calculator.

Regions Impacted By Sclerotinia

Key Challenges with Sclerotinia:

  • Variability in its prevalence and severity from year to year, region to region, and field to field
  • Prevalence has a direct correlation to above-average moisture
  • Even after infection, the severity of symptoms and the effect on yield will vary according to temperature, rainfall, crop density and especially the crop stage at the time of infection
  • Regular rains or high humidity a few weeks before and during flowering generally result in sclerotinia infection. If these conditions continue after flowering, severity of the disease can be high and yield loss can be significant

Growers Talk

At Bayer, we could say a lot about our Proline® fungicide. But we’d rather let our growers do the talking.

Active Ingredients

Prothioconazole - Group 3


Brown Mustard
Oriental mustard
Yellow Mustard

Diseases Controlled

Asian soybean rust
Crown rust
Glume blotch
Grey leaf spot
Leaf rust
Net blotch
Northern blight
Sclerotinia stem rot
Septoria leaf blotch
Tan spot

Diseases Suppressed

Fusarium head blight
Gibberella ear rot

Provinces Registered

British Columbia
New Brunswick
Northwest Territories
Nova Scotia
Prince Edward Island



  • Canada's number one canola fungicide
  • Easy-to-use liquid formulation 
  • Treats 80 acres in one single case
  • Treated acres outyield untreated acres, even when sclerotinia isn’t visible
  • Manages risk of disease overwintering in the soil and sets the field up for future years’ crop
  • Cleaner fields result in faster swathing and combining at harvest
  • There is always a yield benefit, increasing proportionately with infection rates


Application Tips

Canola, borage, crambe, mustard and flax 128-140 mL/ac.
(40-35 ac./jug)
Standard rate1
Barley, oats and wheat 128-170mL/ac.
(40-30 ac./jug)
Apply with a non-ionic surfactant and 0.125% v/v
Chickpeas and lentils 128-170 mL/ac.
(40-30 ac./jug)1
Corn 170 mL/ac.  
Soybeans 85 mL/ac.  
Sunflower and safflower 170 mL/ac.
(30 ac./jug)

1A non-ionic surfactant is not required when applying Proline on canola or pulses

Canola, mustard and flax Apply Proline® when the crop is in the 20 to 50% bloom stage. Best protection will be achieved when the fungicide is applied prior to petals beginning to fall, and will allow for the maximum number of petals to be protected. View the canola bloom stage timing guide.
Barley Apply Proline as a preventative spray within the time period when 70 to 100% of the barley main head stems are fully emerged to three days after full emergence.
Pulses Apply Proline at the first sign of disease.
Wheat Apply Proline within the time period from when at least 75% of the wheat heads on the main stem are fully emerged to when 50% of the heads in the main stem are in flower.
Oats Apply Proline as a preventative foliar spray when the earliest disease symptoms appear on the leaves and stems.
Corn Apply Proline from the development stage of corn between the tip of stigmata visible (silking) to the stigmata drying (silk browning).
Sunflower and safflower Apply Proline when the crop is in the 10 to 50% disk flower bloom stage.


Water Volume
  • Aerial - minimum of 4.5 US gal./ac. (17 L/ac.)
  • Ground - minimum of 10 US gal./ac. (38 L/ac.)


Rainfast one hour after application

Related Products

To help you get the most out of your canola, Bayer offers a breadth of innovative crop protection solutions.

Canola Crop Protection



Start your canola off with the best chance of success with a simple tank mix of Pardner® herbicide with your pre-seed application of RoundUp WeatherMAX® herbicide, or glyphosate of your choice. Learn More

Prosper EverGol  

Prosper EverGol

Prosper EverGol seed treatment provides targeted protection of your canola seed with four different active ingredients, including penflufen for outstanding defence against rhizoctonia. Learn more



Decis insecticide controls a wide range of lepidopteran insects including Bertha armyworms, cutworms, and diamondback moths as well as flea beetles, lygus bugs and grasshopers. Learn more

BayerValue Program
As one of the only companies who can offer a complete lineup of crop protection products and program savings, Bayer allows you to harness the full potential of your crop. You can save up to 10% on Proline® through the Purchase Bonus. Learn more