Contingent upon continued freedom of Northwest Mexico and of the West Coast of Mexico from infestations of the pink bollworm and other plant pest conditions that would increase risk of pest introduction into the United States with importations authorized under this section, entry of the following products may be authorized under permit subject to inspection upon arrival to determine freedom from hazardous plant pest conditions:

(a) Lint, linters, and waste.

(b) Cottonseed.

(c) Cottonseed hulls.

(d) Covers that have been used for cotton only.