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Protect your yields. Harvest the rewards.

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

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


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.

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

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


In 2014, the Grain Corn Ear Mould and Vomitoxin Survey carried out by Ontario Ministry of Agriculture, Food and Rural Affairs (OMAFRA) to determine ear mould incidence and the occurrence of mycotoxins in the grain, showed that high DON concentrations (>5.0 PPM) was closely associated with ears that had Western Bean Cutworm (WBC) feeding.

Remember to scout for WBC as feeding damage fosters the development of ear moulds and toxins. If damage is evident applying an insecticide at early silking and tank-mixing it with Proline will protect your crop from late season leaf diseases, lower DON levels and maximize your crop’s yield.

Corn Protection

Proline is the only fungicide registered to suppress fusarium & gibberella ear rot and stalk rot pathogens. Because of its activity on ear rot, Proline effectively reduces DON levels. All this plus late season disease control means higher yields at harvest.

Proline Maximizes Your Corn Yield And Provides Best-In-Class Late Season Lead Disease Protection And DON Reduction

Comparison of disease severity, DON suppression, and yield using Proline fungicide compared to competitors
Apply Proline fungicide at Early R1 Day 0 growth stage to optimize control of leaf diseases and DON reduction
Growth Stage   Early Tassel
first signs of tassel are visible
  VT DAY -2
begins when last branch of tassel is completely visible
  Early R1 Day 0
begins when first silk is visible outside husk

scout for this
  Full R1 Day +2
lots of moist silk is visible outside husk
R2 Day +10
silks are darkening and drying out
silks are brown and dry or becoming dry
Optimal application timing of Proline fungicide to control leaf diseases and DON reduction


Timing – Corn
Disease Rate Timing
Grey leaf spot
Northern blight
315 mL/ha
(128 mL/ac.)
Apply at early tassel to the start of silking
Late season leaf diseases above plus:
Fusarium ear rot (suppression)
Gibberella ear rot (suppression)
Stalk rot pathogens (suppression)
   Fusarium spp.
   Gibberella spp.
   Colletotrichum spp.
420 mL/ha
(170 mL/ac.)
Apply from the development stage of corn between silking and silk browning. Scout for Day 0 (early R1) when the first silks are present out the husk.


Wheat Timing of application is critical. For optimum protection against Fusarium head blight, apply from when at least 75% of the wheat heads on the main stem are fully emerged to when 50%of the heads on the main stem are in flower
Barley Unlike wheat, which flowers after it has completely headed, barley begins to flower in the boot. While the disease can infect the barley head prior to total head emergence, it is important to wait until most of the barley heads have emerged to attain maximum coverage. Applying Proline at this time will protect the exposed florets from the risk of infection. Delaying application past head emergence will reduce protection and increase the risk of disease infection
Canola The goal when applying Proline is to protect as many canola flower petals as possible, prior to significant petal drop. The optimum timing is between 20 and 30% bloom. Application with Proline fungicide can occuf from 20 - 50% bloom. To accurately identify the bloom stage of your crop, follow these steps: 1. Find the main stem. 2. Pull off the secondary branches. 3. Count only the open flowers on the main stem including aborted flowers and newly formed pods. 4. Sample several plants across the field.
Soybeans R 1-R 5 (R 2-R 3 or at onset of pod formation is optimal).

For all other crops consult the label.

A non-ionic surfactant is not required when applying Proline on canola, pulses, corn or soybeans.
Canola 128 mL/ac. 5.1 L jug (standard rate) treats 40 acres
Cereals 128 mL/ac. 5.1 L jug treats 40 acres (apply with non-ionic surfactant)
  • Leaf disease control: 316 mL/ha (128 mL/ac.) Each 5.1 L jug treats 16.2 ha (40 ac.)
  • Fusarium and gibberella ear rot suppression (DON reduction) and late season leaf disease control: 420 mL/ha (170 mL/ac.) Each 5.1 L jug treats 12 ha (30 ac.)
Soybeans 128 mL/ac. 5.1 L jug treats 40 acres
Water Volume
Aerial - 50 L/ha (4.5 gal./ac.)
Ground - 175 L/ha (19 gal./ac.)


Field corn and sweet corn

Field Corn
Sweet Corn
(Including seed production)



Barley, oats, and wheat




Chickpeas and lentils

Brassica carinata
Low growing berries – except strawberries
Oriental mustard
Sugar beet


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

Diseases Controlled

Ascochyta blight
Asian soybean rust
Crown rust
Frogeye leaf spot
Glume blotch
Grey leaf spot
Gummy stem blight
Leaf rust
Net blotch
Northern Blight
Powdery mildew
Sclerotinia stem rot
Septoria leaf blotch
Tan spot

Diseases Suppressed

Fusarium head blight
Gibberella ear rot
Stalk rot pathogens
Valdensinia leaf spot – blueberry only

Provinces Registered

British Columbia
New Brunswick
Northwest Territories
Nova Scotia
Prince Edward Island