b'of Canadian wheat. Several years of advance notice is providedappropriate seed treatment. Producers are advised to choose when this type of change takes place. Its important to notevarieties with the best FHB tolerance whenever possible and reclassification is not variety cancellation. Reclassified varietiesalways use best management practices to slow the spread of may still be grown and receive grades under the class forthis disease. which they are designated but must not be misrepresentedFusarium graminearum (Fg) is no longer a designated pest by declaring their former class. Variety Designation Lists canin Alberta. Removal of Fusarium graminearum from the be found at the Canadian Grain Commission website at www. Pest and Nuisance Control regulation brings Alberta in line grainscanada.gc.ca/en/grain-quality/variety-lists/. with best practices from other provinces and allows farmers access to the most current seed varieties (which may have Diseases, Seed Treatment and Seed Testing improved Fg resistance) and cereal research. As such, weDisease ratings are compiled from various data sources inare using best management practices in the Alberta RVTs to Alberta and other prairie provinces. responsibly address this disease. https://www.alberta.ca/ L oose smut resistance ratings for wheat will not be reportedalberta-fusarium-graminearum-management-plan.aspx after 2020 as its no longer a registration requirement forLaboratories participating in the FHB testing program:wheat and routine testing has been discontinued.20/20 Seed Labs Ltd., Nisku, Alta. (877) 420-2099Treat rye and flax seed to control seedling blight, cereal SGS Canada Inc., Sherwood Park, Alta. (800) 952-5407seed for smuts and fusarium, canola seed to control flea SGS Canada Inc., Grande Prairie, Alta. (877) 532-8889beetle, seedling blight and the seed borne phase of virulent Precision Seed Testing, Beaverlodge, Alta. (780) 354-2259blackleg.Seed Check Technologies Inc., Leduc, Alta. (780) 980-8324Wheat with Moderately Susceptible (MS) or Susceptible (S) ratings for common bunt should be treated with a systemicAgronomic Practices Used in Small Plot Trialsfungicidal seed treatment as low levels of infection willSmall plot trials are conducted using the following best restrict marketability. agronomic practices: Refer to labels for maximum storage periods of treated seed. N, P, K and S fertilizer rates are based on soil test resultsT reated seed must not be fed to livestock, poultry or wildlife,for 1.25x the area average yield goal of the past 4 years, as and cannot be sold for feed.reported in the AFSC Yield Alberta publication.Fusarium head blight (FHB), caused by FusariumAll wheat, barley, oat and triticale seed are treated with graminearum and other species, is an increasing problem inCruiser Maxx Vibrance Quattro. Flax seed is not treated.Alberta. The relative ranking of crops from most susceptible S eeding rates are adjusted for TKW and germination to reach to least susceptible is durum wheat, spring and winter wheat,the following target plant populations listed in Table 1.triticale, barley and oat. Corn is a host of F. graminearum and can serve as a source of infection when residue is left on the ground. FHB infection is highly influenced by the environment and heading date. A resistant (R) tolerance rating for FHB does not equate to immunity. Under severe epidemics, all varieties will sustain damage. All seed should be tested for the presence of FHB and treated with an Spring 2022 63'