New standard samples for assessing mildew and frost/heat stress in wheat

As part of its grain grading modernization project, the Canadian Grain Commission initiated a review of the standard samples used for visual assessment of frost/heat stress and mildew in all classes of wheat. New research conducted by the Canadian Grain Commission has proven that these grading factors do not have a compounding negative effect on the end-use functionality of wheat and should be individually assessed to prevent unnecessary downgrading of wheat.

The CGC presented this information to the Western and Eastern Standards Committees who recommended the following changes:

  • The Western Standards Committee recommended that the standard samples for wheat, which have a combination of mildew and frost/heat stress, be repealed and the mildew and frost/heat stress guide samples, which are currently in place, be approved as the new mildew standard and frost/heat stress standard samples as of August 1, 2018. As of this date, mildew and frost/heat stress will be evaluated individually using the applicable standard samples.
  • Eastern Standards Committee recommended renaming the current mildew guides as mildew standards as of July 1, 2018.

Standard samples for 2018-2019 Crop Year

Western wheat classes

The Canadian Grain Commission approves the use of the following standard samples for the 2018-2019 crop year:

A version of this table published on June 6, 2018, indicated the applicable frost/heat standard for No. 3 CWHWS was 2011 No. 3 CWHWS. The applicable standard is actually 2011 No. 3 CWRS. The table has been corrected.

Frost Standard (Currently titled Frost/Heat Stress Guides)
Grade / Class Applicable Standard (Frost/Heat Stress)
No.1 CWRS 2014 No.1 CWRS
No.2 CWRS 2015 No.2 CWRS
No.3 CWRS 2011 No.3 CWRS
No.1 CWRW Not available
No.2 CWRW Not available
No.3 CWRW Not available
No.1 CNHR 2014 No.1 CWRS
No.2 CNHR 2015 No.2 CWRS
No.3 CNHR 2011 No.3 CWRS
No.1 CWAD 2015 No.1 CWAD
No.2 CWAD 1999 No.2 CWAD
No.3 CWAD 1999 No.3 CWAD
No.4 CWAD 1999 No.4 CWAD
No.1 CWSWS 2014 No.1 CWRS
No.2 CWSWS 2015 No.2 CWRS
No.3 CWSWS 2011 No.3 CWRS
No.1 CWES 2015 No.2 CWRS
No.2 CWES 2011 No.3 CWRS
No.1 CPSR 2015 No.2 CWRS
No.2 CPSR 2011 No.3 CWRS
No.1 CPSW 2015 No.2 CWRS
No.2 CPSW 2011 No.3 CWRS
No.1 CWHWS 2014 No.1 CWRS
No.2 CWHWS 2015 No.2 CWRS
No.3 CWHWS 2011 No.3 CWRS
Mildew Standard (Currently titled Mildew Guide)
Grade / Class Applicable Standard (Mildew)
No.1 CWRS 2016 No.1 CWRS
No.2 CWRS 2016 No.2 CWRS
No.3 CWRS 2016 No.3 CWRS
No.1 CWRW 2016 No.1 CWRW
No.2 CWRW 2016 No.2 CWRW
No.3 CWRW 2016 No.3 CWRS
No.1 CNHR 2016 No.1 CWRS
No.2 CNHR 2016 No.2 CWRS
No.3 CNHR 2016 No.3 CWRS
No.1 CWAD 2016 No.1 CWAD
No.2 CWAD 2016 No.2 CWAD
No.3 CWAD 2016 No.3 CWAD
No.4 CWAD Not available
No.1 CWSWS 2016 No.1 CWRS
No.2 CWSWS 2016 No.2 CWRS
No.3 CWSWS 2016 No.3 CWRS
No.1 CWES 2016 No.2 CWRS
No.2 CWES 2016 No.3 CWRS
No.1 CPSR 2016 No.2 CWRS
No.2 CPSR 2016 No.3 CWRS
No.1 CPSW 2016 No.2 CWRS
No.2 CPSW 2016 No.3 CWRS
No.1 CWHWS 2016 No.1 CWRS
No.2 CWHWS 2016 No.2 CWRS
No.3 CWHWS 2016 No.3 CWRS

Eastern wheat classes

The Canadian Grain Commission approves the renaming of guides as standards for the 2018-2019 crop year.

  • No.1 Canada Eastern Red, 2005, Mildew Guide Standard
  • No.3 Canada Eastern Red, 2000, Mildew Guide Standard (11/06/00)
  • No.1 Canada Eastern Red (Winter), 2013, Mildew Guide Standard
  • No.2 Canada Eastern Red (Winter), 2013, Mildew Guide Standard
  • No.1 Canada Eastern Red (Red Spring), 2012, Mildew Guide Standard
  • No.2 Canada Eastern Red (Red Spring), 2012, Mildew Guide Standard
  • No.3 Canada Eastern Red (Red Spring), 2006, Mildew Guide Standard (08/17/06)
  • No.1 Canada Eastern White Winter, 2012, Mildew Guide Standard
  • No.2 Canada Eastern White Winter, 2009, Mildew Guide Standard (11/20/09)

Further review and adjustments

As part of the review of standard samples, the Canadian Grain Commission’s Grain Research Laboratory will continue to look at the composition of the mildew and frost/heat stress standards in relation to the impact of mildew and frost/heat stress on end-use functionality. Based on this research, the Canadian Grain Commission may further adjust standard samples to ensure they are accurate, relevant and objective tools.

If you have any questions, you can contact Gino Castonguay at 204-983-2780 or gino.castonguay@grainscanada.gc.ca.

Gino Castonguay
Chief Grain Inspector for Canada

Date modified: