Category Archives: white rust

White rust on crucifers

Last week we received some turnip leaves into the lab with white patches on the undersides. After examining the leaves more closely under the dissecting and compound microscopes, we saw that the white patches were actually “rust” pustules containing sporangia. The pathogen, Albugo candida, which causes this disease, white rust, is actually not a true rust as it is not a member of the kingdom Fungi. However, the organism does imitate the true rusts in the manifestation of its reproductive structures as well as in the fact that… Read More →