First report of Guignardia citricarpa in the USA
In March 2010, symptoms of citrus black spot were detected in the USA on commercial Valencia sweet oranges (Citrus sinensis) in the Immokalee area (Collier county), Florida. Laboratory analysis confirmed the presence of Guignardia citricarpa (EPPO A1 List). This is the first time that G. citricarpa is reported from North America. For the moment, it is not known how this pathogen was introduced into Florida. An appropriate regulatory response for this incursion is being devised and delimiting surveys are underway.
The situation of Guignardia citricarpa in the USA can be described as follows: Present, an incursion was first found in March 2010 in Florida (Collier county), under official control.
Sources
Schubert T, Sutton B, Jeyaprakash A (2010) Pest Alert - Citrus black spot (Guignardia citricarpa) discovered in Florida. Florida Department of Agriculture and Consumer Services. http://www.doacs.state.fl.us/pi/enpp/pi-pest-alert.html
USDA (2010) USDA confirms new citrus disease in Florida. News Release of 2010-04-08. http://www.aphis.usda.gov/newsroom/content/2010/04/fla_citrus_disease.shtml