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Exobasidium Leaf Gall

Clemson University - USDA Cooperative Extension Slide Series, Bugwood.org
Exobasidium spp.   Exobasidium leaf and flower gall  is more common during cool and wet spring weather. Host plants include azaleas and rhododendrons.

The first symptoms are swollen or puffy portions on newly expanding leaves, shoots, buds or flowers. These areas turn into galls that range in color from green, silvery white, to pink or red depending on the part of the plant infected. As these galls age they develop a white surface growth which consists of a layer of reproductive spores. Eventually the infected plant part will turn brown and shrivel up into hard galls.

Fungicide sprays are not effective for the control of this disease. Prevention strategies involve hand picking the galls off before they develop the white sporulating surfaces. This will reduce the incidence of disease next season.
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