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Citrus Health Response Program |
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Citrus Black Spot
Citrus Black Spot is a fungal disease marked by dark, speckled spots or blotches on the rinds of fruit, citrus black spot is an economically significant citrus disease. It causes early fruit drop, reduces crop yield, and renders the highly blemished fruit unmarketable. While all commercial citrus cultivars are susceptible to citrus black spot, the most vulnerable are lemon and late-maturing citrus varieties like Valencia. Although disease symptoms are expressed clearest on the rinds of fruit, the risk of this disease spreading through fruit movement is minimal. The greatest risk of disease transmission is associated with the inoculum of fallen, decomposing citrus leaves.
Citrus black spot occurs in subtropical regions of the world with summer rainfall. The disease has been found in Argentina, coastal areas of Australia, Brazil, China (mainland and Hong Kong), Indonesia, Japan, Kenya, Mozambique, Nigeria, Peru, Philippines, areas of South Africa with summer rainfall, Swaziland, Taiwan, Uruguay, Venezuela, and Zimbabwe.
News and Information
- APHIS Expands Citrus Black Spot (Guignardia citricarpa) Regulated Area in Florida
- USDA Confirms New Citrus Disease in Florida
- NAPPO Pest Alert (PDF; 15 Kb)
- Program Status Reports
Federal Quarantine Notices and Federal Order
- APHIS Expands Citrus Black Spot (Guignardia citricarpa) Regulated Area in Florida (3/26/13) (PDF;
158 Kb)
- Map - Collier & Hendry County (PDF; 990 Kb)
- Map - Polk County (PDF; 444 Kb)
- Description of Area Affected (PDF; 46 Kb)
- APHIS Expands the Regulated Area for Citrus Black Spot (Guignardia citricarpa) in Florida and Announces Process for Future Changes to the Regulated Area (3/16/12) (PDF;
14 Kb)
- Federal Order (3/16/12) (PDF; 50 Kb)
- Citrus Black Spot Packing House Procedures (PDF; 20 Kb)
- Quarantine for Guignardia citricarpa Kiely, Causal Agent of Citrus Black Spot (CBS) (6/2/11) (PDF; 21 Kb)
- Citrus Black Spot Packing House Procedures (PDF; 20 Kb)
- Revised Federal Order for Citrus Black Spot in
Florida (3/8/11) (PDF; 42 Kb)
- Citrus Black Spot Packing House Procedures (PDF; 23 Kb)
- Revised Federal Order for Citrus Black Spot in Florida (1/21/11) (PDF; 27 Kb)
- Citrus Black Spot Packing House Procedures (PDF; 23 Kb)
- APHIS Issues Federal Order for Citrus Black Spot in Florida (PDF; 56 Kb)
- Confirmation of Citrus Black Spot in Florida - SPRO (4/7/10) (PDF; 8Kb)
- Confirmation in Hendry County, Florida - SPRO (6/7/10) (PDF; 14 Kb)
Quarantined Areas
- Collier, Hendry, and Polk Counties in Florida (PDF; 41 Kb)
Maps
- Collier and Hendry Quarantine Zone Map (PDF; 858 Kb)
- Polk County Quarantine Zone Map (PDF; 436 Kb)
Scientific Information
- Technical Working Group Report, June 2010 (PDF; 370 Kb)
- Risk Assessment of Citrus spp. Fruit as a Pathway for the Introduction of Guignardia citricarpa Kiely, the Organism that Causes Citrus Black Spot Disease (PDF; 985 Kb)
On-Line Resources
- Florida Department of Agriculture & Consumer Services
- University of Florida's Citrus Research and Education Center
Other Citrus Diseases
