From Brussels, China or Milan. “Surnames” aside, cabbages are grown nowadays all over the world. Like them, many other plants from the Brassicaceae family such as cauliflower, broccoli, cabbage and even mustard… yes, strange as it may seem and though their tastes are very different, a Brussels sprout and a mustard seed belong to the same family…have a common enemy. The enemy is white rust, or at least one kind of white rust. Specifically, cabbages are threatened by a disease caused by a pathogen called Albugo candida, which acts exactly like a fungus, though it is not actually a fungus. That is to say, it spreads under the right conditions of humidity and temperature and eats up the nutrients of the plants it attacks.