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Canker,bacterial
Citrus canker is a citrus disease caused by the bacterium Xanthomonas citri subsp. citri. Severe disease can cause defoliation, premature fruit drop, twig dieback, general tree decline, and significant blemishes on fruit. Trees infected with canker become weak and unproductive.The disease is not a risk to human or animal health, but has reduced marketability as fresh fruit.
The bacterium can survive for long periods of time in diseased tissues that includes the discoloration of tree bark on trunks and limbs.
Citrus canker is primarily spread short distances through high wind and rain, water splash, and may be assisted by irrigation systems. Citrus leafminer larvae can also aid in spreading citrus canker by exposing internal plant tissue. The most critical time for fruit infection is usually 90 days after petal fall where the bacterium will remain in the infected hosts until leaves and fruits fall.