It shall be unlawful to sell, offer for sale or transport plants, buds, trees, shrubs, vines, tubers, bulbs, roots or cuttings known to be infested with dangerous or injurious insects or plant diseases; and any person violating the provisions of this section shall be deemed guilty of a misdemeanor and, upon conviction, shall be fined in a sum not exceeding one hundred dollars or imprisoned in the county jail for not exceeding thirty days.