In order to develop and encourage home industry and to protect and promote the interests of producers and provide consumers with food products of uniform grade and quality at fair and reasonable prices, it shall be the duty of the commissioner and he shall have authority to promote, regulate, coordinate, establish and conduct a system of marketing agricultural products in the State of West Virginia. He shall assist producers and handlers in the grading, classification and standardization of agricultural products at public markets, concentration points, packing, grading and processing plants and other places where agricultural products are assembled for distribution.