Submitted by: Pam de Rocquigny, Provincial Cereal Crops Specialist
The Manitoba Crop Variety Evaluation Team (MCVET) initiated a three year study in 2009 to evaluate the effect of Fusarium Head Blight (FHB) on Canada Western Red Spring (CWRS) wheat varieties with varying levels of FHB resistance. Western Grains Research Foundation (WGRF) funded 2 more years to build upon that research as the turnover of varieties evaluated by MCVET requires on-going analysis to evaluate the responses of newly registered varieties.
Two objectives of the study were:
- Evaluate how CWRS varieties being tested by MCVET respond to FHB under non-misted (natural infection) over a wide geographic area; and
- Use mixed model analysis to calculate long term average variety means of fusarium damaged kernels (FDK) and deoxynivalenol (DON).
There were thirty-three CWRS varieties evaluated by MCVET and tested for FDK and DON over the five-year study. All varieties were not tested in each of those years. Mixed model analysis was used to calculate a model-based estimate of FDK and DON level means, adjusting for factors such as year, location and interactions.
Results show the effect of variety on FDK and DON levels was significant. In the figure “Levels of Fusarium Damaged Kernels (FDK) and Deoxynivalenol (DON) by CWRS Variety (2009 – 2013)“, varieties are grouped by level of resistance to FHB. Although infection levels were generally low over the five years, a slight trend exists where the varieties rated as Moderately Susceptible (MS) or Susceptible (S) have higher levels of FDK and DON compared to the varieties rated as MR or Intermediate (I).
Analyzing FDK and DON data using mixed model analysis also allows head to head comparisons of varieties which may not have been tested together. Use of the Least Significant Difference (LSD) value allows producers to determine if significant differences do exist between varieties. In the table “Long Term Average Means of Fusarium Damaged Kernels (FDK) and Deoxynivalenol (DON) for CWRS Varieties Evaluated by MCVET (2009 – 2013)“, the model-based estimate of FDK and DON level means are presented, along with the LSD value and grand mean of the five year database. Individual varieties must differ by the LSD value to be considered significantly different; for FDK (%), values must differ by 0.53 while for DON (ppm) values must differ by 0.5.
Variety by location data for FDK and DON data for 2012 and 2013 for CWRS varieties evaluated by MCVET is available on-line at www.seedmb.ca at http://www.seedmb.ca/webexclusive/wheat-quality-disease.asp, as well as 2013 FDK and DON data for varieties belonging to the CPS, CWHWS, and CWGP wheat classes.
If interested in the complete report titled “Post-registration Assessment of Spring Wheat Varieties Response to Fusarium Head Blight, please contact [email protected].