Sweet orange scab has been found on citrus trees in Texas and Louisiana.

The findings were made on residential properties, not in commercial growing areas, the U.S. Department of Agriculture’s Animal and Plant Health Inspection Service reported Aug. 23.

This is the first evidence in the U.S. of sweet orange scab, a fungal pathogen that poses no risk to humans but can produce lesions on fruit rinds and sometimes on leaves and twigs.

Sweet orange scab does not affect internal quality or taste, but it can cause fruit to drop from trees prematurely.

APHIS has established a technical working group to recommend strategies for preventing the pathogen’s spread.