Citrus canker is a citrus disease caused by a bacteria. While not harmful to humans, canker significantly affects the vitality of citrus trees, causing leaves and fruit to drop prematurely. Citrus canker causes lesions on citrus leaves, stems, and fruit. Characteristic lesions are raised and brown, have water-soaked margins, and usually have a yellow halo surrounding the lesion. Older lesions appear corky. Symptoms generally appear within 14 days of exposure to the canker bacteria. The bacteria remain viable in old lesions and on plant surfaces for several months. A fruit infected with canker is safe to eat but has reduced marketability as fresh fruit.
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