It shall be unlawful for any person to ship or offer for shipment or for any carrier, or any steamship company, or any person to transport or receive for transportation to any foreign destination, except as provided in this chapter, any grapes or plums of any variety in packages which are not accompanied by a certificate issued under authority of the Secretary showing that such grapes or plums are of a Federal or State grade which meets the minimum of quality established for such variety and destination by the Secretary for shipment in export to such destination. The Secretary is authorized to prescribe, by regulations, the requirements, other than those of grades, which the fruit must meet before certificates are issued. The Secretary shall provide opportunity, by public hearing or otherwise for interested persons to examine and make recommendation with respect to any standard of export proposed to be established or designated, or regulation prescribed, by the Secretary for the purposes of this chapter.

The Secretary shall give reasonable notice through one or more trade papers of the effective date of standards of export established or designated by him under this chapter: Provided, That any grapes or plums may be certified and shipped for export in fulfillment of any contract made within two months prior to the date of such shipment if the terms of such contract were in accordance with the grades and regulations of the Secretary in effect at the time the contract was made.

Where the government of the country to which the shipment is to be made has standards or requirements as to condition of grapes and plums the Secretary may in addition to inspection and certification for compliance with the standards established or designated hereunder inspect and certify for determination as to compliance with the standards or requirements of such foreign government and may provide for special certificates in such cases.

The Secretary may, by regulation, exempt from compliance with the provisions of this chapter (1) any variety or varieties of grapes and plums, and (2) the shipment of such minimum quantities of grapes and plums to any foreign country as he may prescribe.

For inspecting and certifying the grade, quality, or condition of grapes or plums the Secretary shall cause to be collected a reasonable fee which shall, as nearly as may be, cover the cost of the service rendered: Provided, That when cooperative arrangements satisfactory to the Secretary, or his designated representative, for carrying out the purposes of this chapter cannot be made the fees collected hereunder in such cases shall be available until expended to defray the cost of the service rendered, and in such cases the limitations on the amounts expended for the purchase and maintenance of motor-propelled passenger-carrying vehicles shall not be applicable: Provided further, That certificates issued by the authorized agents of the United States Department of Agriculture shall be received in all courts of the United States as prima facie evidence of the truth of the statements therein contained.

After opportunity for hearing the Secretary is authorized to refuse the issuance of certificates under this chapter for periods not exceeding ninety days to any person who ships or offers for shipment any grapes or plums in foreign commerce in violation of any of the provisions of this chapter. Any person or any common carrier or any transportation agency violating any of the provisions of this chapter shall be fined not less than $100 nor more than $10,000 by a court of competent jurisdiction.

The Secretary may make such rules, regulations, and orders, and require such reports, as may be necessary to carry out the provisions of this chapter, and may cooperate with any department or agency of the Government, any State, Territory, District, or possession, or department, agency, or political subdivision thereof, or any person, whether operating in one or more jurisdictions; and shall have the power to appoint, remove, and fix the compensation of such officers and employees not in conflict with existing law, and make such expenditures for rent outside the District of Columbia, printing, binding, telegrams, telephones, law books, books of reference, publications, furniture, stationery, office equipment, travel, and other supplies and expenses including reporting services, as shall be necessary to the administration of this chapter in the District of Columbia and elsewhere, and as may be appropriated for by Congress. This chapter shall not abrogate nor nullify any other statute, whether State or Federal, dealing with the same subjects as this chapter; but it is intended that all such statutes shall remain in full force and effect except insofar as they are inconsistent herewith or repugnant hereto.

If any provision of the chapter or the application thereof to any person or circumstances is held invalid, the validity of the remainder of the chapter and of the application of such provision to other persons and circumstances shall not be affected thereby.