To view PDF files, you must have a copy of the Adobe Acrobat Reader which is available as a free download:
Fusarium Head Blight Report
The first map below shows the current risk for the development of fusarium head blight based on the previous 7 days of temperature and moisture. Below the most current risk map is an animation of the risk maps over the last 7 days showing how the risk has progressed.
Understanding the Saskatchewan and Manitoba FHB Risk Maps
For the first time in 2015, FHB risk maps are available in both Saskatchewan and Manitoba. At a glance, on a given day the maps may appear to indicate a different risk for growers in each province, which can be concerning for farms along the Manitoba-Saskatchewan border. However, closer examination will reveal minor differences in the models and maps useful for considering FHB risk.
In Saskatchewan, maps are created with models (depending on spring or winter wheat) using temperature and/or relative humidity in the previous 5 days, plus 2 days forecast. While in Manitoba, maps are created with a model that uses the hours of precipitation and the hours with temperatures between 15C and 30°C during the previous 7 days. Each province then has its own categorization based on slightly different threshold values - low, moderate, high (and extreme in Manitoba) - based on the output from their respective models.
Models are also constantly validated and fine-tuned for the region where it is relevant. The model that is best for the Fusarium population and conditions in individual provinces in western Canada, or even across the border in the USA, might not be the same. However, crop scientists and pathologists continue to work together to determine how FHB risk maps can be most valuable to all farmers, including those along the border! Producers along the border may have a potential advantage in assessing risk, by using both maps and interpreting which one is most relevant for their farm. And keep in mind risk maps may not perfectly represent a producer’s individual field(s).
Regardless of the model used, no FHB risk map can be taken as a stand-alone tool to make management decisions about FHB as it only takes into account environment. The existence of disease requires 3 factors: the interaction of a susceptible host, a virulent pathogen, and an environment favourable for disease development. So although a risk map in Saskatchewan or Manitoba may show High risk due to environment, disease risk may be low if the wheat crop is not at the proper stage for infection.
We strongly encourage referring to additional information and consultation with local extension specialists and agrologists to determine if fungicide applications are needed to suppress FHB in your area.
If you have any questions on the FHB Risk maps or FHB management, please contact Manitoba Agriculture Food and Rural Development, or the Saskatchewan Ministry of Agriculture.