Blackleg symptoms may develop in more mature plants during the later part of the growing season, and are distinguished from those that develop earlier in the season.
However, oilseed and plant disease specialists with the government aren't disclosing the location of those fields or the canola variety that is infected with blackleg.
Specifically, it causes beet vascular necrosis and blackleg of potato and other vegetables (hence the name "carotovora" - carrot-eater), as well as slime flux on many different tree species.