Canola Watch – September 1, 2021

September 1, 2021

This video includes questions to ask yourself as you scout your canola for disease.

Canola Quiz – Loss

Four questions on the topic of loss: Soil moisture loss, storage loss and combine loss – with tips to prevent all three.

Take the Quiz

In This Issue

Minimize loss with combine optimization, samples

Holding on to as much quality seed as possible is canola growers’ number one priority every year, but minimizing harvest loss is more critical than ever after this difficult growing season. There are tools available to help do this. Check out the Harvest Loss tool to help calculate estimated harvest losses. Then use the “Grain Loss” option in the Combine Optimization Tool to figure out how to minimize the losses. On a related note, there have been reports of green seed and other dockage material in swathed canola throughout western Canada. If you find such material, your best bet is to take a sample, measure the amount of material that is not grain and develop a strategy for conditioning and storage. A list of factors that increase canola storage risk can be found here.

Time to pull some plants

It’s never too late to scout for diseases such as clubroot, blackleg  or  verticillium stripe. However, pre-harvest is the optimal time to do so. Experts recommend randomly pulling field-representative plants to determine the yield impacts from these and other diseases. While you are scouting for disease, make note of plant counts, nutrient deficiencies and insect feeding and record other environmental damage created this season. Look for trends among management practices, the crop protection products applied and the environmental conditions this year to help in the management of future crops.

August rain, September problems

Depending on your location and situation, a dry growing season followed by late rains has created new obstacles to tackle, including a possible need for crop dry-down and a renewed requirement for weed control. This research summary provides some results on pre-harvest herbicide and desiccation options. Always be aware of pre-harvest intervals (PHIs) of crop protection products in order to keep your canola marketable. If in doubt, use the Spray to Swath Interval Calculator. Late rain has resulted in regrowing canola in parts of Manitoba, Saskatchewan and Alberta. Experts recommend desiccating or swathing this regrowth while the crop is still standing; there are no crop products that can be used on regrowing canola once it’s already swathed (see this article). Moisture-sucking winter annual weeds have also been spotted in the same regions. Advice for managing weeds in the fall — including winter annuals — is available here.

Post-harvest a good time to count canola stems

It might be an early reminder for some, but don’t forget to do a post-harvest stem count. This lets you calculate your crop’s survival percentage and compare the results to spring plant counts. By collecting a few years’ worth of plant stand data and cross-referencing it with seeding rate, yield, seed quality and maturity records, producers can determine their own most economic target plant stands and seeding rates. Farmers can also enter fall stubble counts and re-calculate emergence at The crowdsourced data can be found  here.

Scout Checklist

Sclerotinia stem rot



Verticillium stripe

Alternaria black spot

Swath timing

Community Connect

Want to keep up on what is happening with all crop diseases? Subscribe to the Prairie Crop Disease Monitoring Network (PCDMN) blog by submitting your email address via the “subscribe” option on the PCDMN Blog. The blog is operated by researchers at Agriculture and Agri-Food Canada. The PCDMN’s main focus is to provide timely information about crop diseases on the Prairies, their identification and assessment, and to highlight effective disease management approaches. It also has a Twitter feed (@pcdmn) that features timely field crop disease information during the growing season as well as updates during the fall and winter.

The Western Forum on Pest Management meeting offers a yearly summary of the year’s pathology and entomology concerns in western Canada. Hold the dates of October 27-29 for participation in their online meeting in 2021. Watch here or for registration information and details soon.

Canola Week, Canada’s premier series of canola industry meetings focused on research and industry news, will be a virtual conference again this year. Save the date for November 30 to December 2, 2021. Keep an eye here for details.

Free testing in Manitoba. Members of the Manitoba Canola Growers now have the opportunity to receive free sample testing through the Pest Surveillance Initiative (PSI) lab. The PSI Lab focused originally on the detection of low-level mapping of clubroot in Manitoba, but capabilities of the lab have expanded to include testing and mapping for glyphosate-resistant kochia and most recently testing for blackleg, blackleg race identification and verticillium stripe. For more information, visit Testing services are also available in Saskatchewan through SaskCanola. Click here for more information. This article discusses how grower-submitted soil samples support collective measures to manage blackleg.

SaskCanola disease testing. SaskCanola offers free clubroot and blackleg disease testing programs available this fall for registered canola growers in Saskatchewan. Visit and for more information. In addition to direct benefits to the grower, see how submitting samples provides additional benefits and supports subsequent findings.



Canola Watch is a free, unbiased, timely and research focused weekly newsletter from the Canola Council of Canada Crop Production Team

You can subscribe to Canola Watch and search all the articles on the Canola Watch website

contact a Canola Council of Canada agronomy specialist

Upcoming Events

Grower Engagement Meeting - Olds

The Grower Engagement Meetings offer growers an opportunity to provide direct feedback to the regionally elected directors and staff from Alberta Canola.
Nov 29
Olds, Alberta

Farm HR: Building Practical HR Policies

Effective HR policies are the backbone of every business. A comprehensive and up-to-date Employee Handbook is your primary tool for ensuring your HR policies are accessible and staff are aware of them.
Nov 30
Online, Webinar

Grower Engagement Meeting - Fort Saskatchewan

The Grower Engagement Meetings offer growers an opportunity to provide direct feedback to the regionally elected directors and staff from Alberta Canola.
Dec 1
Fort Sasktchewan, Alberta

Join our mailing list to receive important news and event updates!

Subscribe to our newsletters