Section 98. The director, with the approval of the commissioner, shall, subject to the provisions of chapter thirty A, adopt vegetable seed and flower seed germination standards, prescribe rules and regulations from time-to-time, and in like manner, modify or amend rules and regulations governing the methods of sampling, inspecting, analyzing, testing and examining agricultural, vegetable, flower or tree and shrub seed and the tolerances to be followed in the administration of sections eighty-four to one hundred, inclusive, which shall be in general accord with officially prescribed practice in interstate commerce, and such other rules and regulations as may be necessary to secure the efficient enforcement of said sections.