By Patrick Donohue,

BEAUFORT, Fla. -- Ned Rahn isn't sure where in Beaufort County federal agriculture surveyors found one of the world's most dangerous citrus pests. He just knows it wasn't on his trees.

Rahn and his wife, Faye, own 300 to 400 citrus plants near their home in Port Royal. They sell lemon, orange, grapefruit and lime trees to area residents, nurseries and landscaping companies.

A new state and federal quarantine will keep Rahn and other citrus growers in three South Carolina counties -- including Beaufort County -- from shipping trees out of the area.

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