The quarantined articles are: (1) any stage of development of the Formosan termite, Coptotermes formosanus Shiraki; (2) used railroad cross ties; and (3) any other products, articles, or means of conveyance of any character whatsoever, not covered by paragraphs (1) and (2) of this section, are quarantined articles when it is determined that they present a hazard of spread of the Formosan termite and the person in possession thereof has been so notified.