The department:
(1) shall direct the inspection, grading, and classification of grapefruit and oranges;
(2) shall adopt and enforce rules relating to grading, packing, and marketing grapefruit and oranges;
(3) may adopt rules relating to marking containers, issuing certificates of inspection, and tagging transportation vehicles and other rules the department considers necessary to improve the methods by which grapefruit and oranges are marketed;
(4) may adopt rules that adopt a financing plan for inspection contributions under a cooperative plan under Subchapter D of this chapter; and
(5) shall adopt rules relating to the licenses required under this chapter.