Citrus canker:

Citrus canker , caused by the bacterium Xanthomonas citri subsp. citri, affects the leaves, twigs and fruit of citrus plants causing the leaves to drop and unripe fruit to fall to the ground. All types of citrus are affected by the disease. Citrus canker is a disease affecting Citrus species caused by the bacterium Xanthomonas citri. Infection causes lesions on the leaves, stems, and fruit of citrus trees, including lime, oranges, and grapefruit. Citrus canker is a ravaging bacterial disease threatening citrus crops. Its major types are Asiatic Canker , Cancrosis B, and Cancrosis C, caused by Xanthomonas citri pv. citri (Xcc), Xanthomonas citri pv. aurantifolii pathotype-B (XauB), and pathotype-C (XauC), respectively. Symptoms of Citrus Canker : The disease affects all above-ground parts of the tree, but most susceptible a.re the leaves, twigs and fruits. It particularly produces scabby lesion on the surface