Photo 1. White rust (or white blisher rust), Albugo ipomoeae-aquaticae, on the underside of kangkong, Ipomoea aquatica.

Photo 2. Blisters of cabbage white rust, Albugo candida, on the outer leaves of Chinese cabbage (especially top right and bottom left).

Photo 3. Pustules of white blister rust, Albugo candida, on the underside of a Chinese cabbage leaf. The pustules have burst and are releasing the powdery spores. On the upper surface the spots are yellow-green.

Photo 4. Pustules of white blister rust, Albugo candida, on the underside of radish leaves. The pustules are round at first, smooth, white and shiny. Later, they are powdery after they have burst to release the spores. Severe infection causes leaves to become distorted and to die early.

Photo 5. Pustules of white blister rust, Albugo candida, on leaves of Indian mustard.

Photo 6. White blister rust, Albugo species, on Ipomoea aquatica (Tonga).

Photo 7. Close-up (Photo 6), white blister rust , Albugo species, on Ipomoea aquatica (Tonga), showing merging blisters containing the sporangia.

Diagram. White blister rust, Albugo candida, longitudinal section of pustule showing sporangiophores and chains of developing sporangia.