Chlorotic patches and lesions at various stages of
development (C. Clark).
may be induced, and release white powdery spores as disease develops (C. Lopes/EMBRAPA).
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
- 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.
in some parts of Asia, Caribbean, Europe, Pacific Islands, South
America and North America.
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