Florida banned shipments from citrus nurseries.

The immediate shipping quarantine was imposed by the state to halt the spread of citrus canker, a highly contagious and incurable plant disease discovered at two nurseries in the past month. Shipments of fruit from Florida’s 600,000-acre citrus belt will not be covered by the ban, said Charles Allen, a spokesman for the state Department of Agriculture. Canker, a bacterial disease, kills citrus trees and blemishes fruit but is harmless to humans.