- Xanthomonas citri, Citrus canker is a very contagious bacterial disease that affects all types of citrus. It is believed that X. citri originated in Southeast Asia
- Signs and Symptoms
- X. citri causes premature leaf and fruit drop. Symptoms include lesions on the fruit, foliage and twigs and usually appear from 1-2 weeks after infection. The entire tree can be defoliated. X. citri effects on fruit range from severe blemishes on the fruit to premature fruit drop.
- X. citri was spread to Japan, South Africa, Australia, the Pacific Islands, South America, and the United States. The hurricanes in 2004 and 2005 spread X. citri so far that eradication was no longer feasible in the United States.
- Control Efforts
- Control of X. citri is achieved through a combination of tactics. These include the use of disease resistant plant varieties, use of protective sprays, and phytosanitary measures. State quarantines may help slow further spread of X. citri until studies can be done to determine the most effective management plans.
ASHA M. BRUNINGS AND DEAN W. GABRIEL. 2003. Pathogen profile. Xanthomonas citri: breaking the surface. MOLECULAR PLANT PATHOLOGY, 4(3), page 141-157. 
Citrus Canker Fact Sheet. Florida Department of Agriculture and Consumer Services. 
Factsheet. 1997. USDA APHIS PPQ. www.Invasive.org 
Images from Bugwood.org