FAQ – What is Himalayan balsam rust?

Like all rusts, the Himalayan balsam rust is an obligate biotrophic fungus, meaning it can only live and survive on living tissue. The rust is an autoecious (meaning it completes its life cycle on Himalayan balsam), macrocyclic (all five spore types are present in the lifecycle) rust fungus, which infects the stem and leaves of Himalayan balsam throughout the growing season.