No employer of seasonal farm labor shall discriminate within the purview of his activities between workers on the basis of sex by paying wages to workers at a rate less than the rate at which he pays wages to workers of the opposite sex for equal work on jobs the performance of which requires equal skill, effort, and responsibility, and which are performed under similar working conditions, except where such payment is made pursuant to an established system which measures earnings by quantity or quality of production. The Secretary of Labor and Industry shall have the power, and it shall be his duty to carry out and administer the provisions of this section pursuant to the act of December 17, 1959 (P.L.1913, No. 694), known as the “Equal Pay Law”.¹