It is unlawful for any person to manufacture, distribute, sell or offer for sale, use or offer to use:
(1) Product registration. (A) Any pesticide which is not registered pursuant to the provisions of this article, or any pesticide if any of the claims made for it or any of the directions for its use differ in substance from the representation made in connection with its registration, or if the composition of a pesticide differs from its composition as represented in connection with its registration, in the discretion of the commissioner, a change in the labeling or formula of a pesticide may be made, within a registration period, without requiring registration of the product, however, changes are not permissible if they lower the efficiency of the product.