Sweet potatoes from Puerto Rico may be moved interstate to Atlantic Coast ports north of and including Baltimore, MD, under limited permit if treated in accordance with part 305 of this chapter or if the following conditions are met:
(a) The sweet potatoes must be certified by an inspector of Puerto Rico as having been grown under the following conditions:
(1) Fields in which the sweet potatoes have been grown must have been given a preplanting treatment with an APHIS-approved soil insecticide.
(2) Before planting in such treated fields, the sweet potato draws and vine cuttings must have been dipped in an APHIS-approved insecticidal solution.
(3) During the growing season an approved insecticide must have been applied to the vines at prescribed intervals.
(b) An inspector of Puerto Rico must certify that the sweet potatoes have been washed.
(c) The sweet potatoes must be graded by inspectors of Puerto Rico in accordance with Puerto Rican standards which do not provide a tolerance for insect infestation or evidence of insect injury and found by such inspectors to comply with such standards prior to movement from Puerto Rico.
(d) The sweet potatoes must be inspected by an inspector and found to be free of the sweet potato scarabee (Euscepes postfasciatus Fairm.).