Mississippi is the latest state in which sweet orange scab has been confirmed.
The fungal disease was identified in fruit collected in residential areas in Pearl River, Hancock and Harrison counties, according to U.S. Department of Agriculture Animal and Plant Health Inspection Service reports.
The USDA has issued emergency action notices to the property owners that bar them from moving fruit and other host materials off the property.
APHIS is working with the Mississippi Department of Agriculture to determine the source and the extent of the infestation.
In July, inspectors found sweet orange scab in residential lemon and tangerine trees near Houston. It has since been confirmed in a total of 11 counties, including those at the heart of the Texas citrus industry.
In addition, sweet orange scab has been found in a total of 15 Louisiana parishes.
In August, a technical working group comprising pathology experts met to try to develop an effective control program.
To read more about sweet orange scab, click here to view a University of Florida EDIS fact sheet.