White rust

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Causal organism: Albugo ipomoea-panduratae (Schw.) Swingle


Other names: common leaf blister, common white blister,leaf mould


Chlorotic patches and lesions at various stages of development (C. Clark).


Galls may be induced, and release white powdery spores as disease develops (C. Lopes/EMBRAPA).

Diagnostic key

  • What you see on plants

- initially chlorotic spots of irregular shape appear.  Pustules of white spores erupt on the lower leaf surface, appearing as small pale lesions on the upper surface. 


- Eventually the spots become angular brown lesions.


- in some conditions, yellowish galls are formed on leaves or stems, which later open and turn white (masses of sporangial pustules).

- leaves may be distorted or may fall off. 

- flower abortion may occur.

- vines may twine while twining types may assume an upright habit.

- in some very sensitive cultivars, witches’ broom symptoms or shortening of internodes may be observed.

  • Infection occurs during periods of rain and cool temperatures.

  • Found in some parts of Asia, Caribbean, Europe, Pacific Islands,  South America  and  North America.


Economic importance

Geographical distribution



Biology and ecology

Host range

Detection and inspection



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