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What is this strange growth on azalea leaves?

Leaf galls, caused by the fungus Exobasidium vaccinii, are common on azalea in the spring during wet, humid, cooler weather. The fungus invades expanding leaf and flower buds causing these tissues to swell and become fleshy, bladder-like galls. Initially, the galls are pale green to pinkish. Eventually, they become covered…
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