The Virulence by Country tool, developed by the University of Aarhus Denmark, displays the frequency of virulence to specific combinations of Sr genes in analysed samples over time for a selected country. Selection of any Ug99 lineage race or specific combination of Sr gene virulence by country is possible. Any new data incorporated into the underlying database will automatically be displayed on the graphs.

NB: These graphs do not represent absolute stem rust Sr gene virulence frequencies at the country level; only sample frequencies are represented.