All fees collected as a result of the inspection and grading provisions set out in this chapter shall be paid into the state treasury, there to be set aside in a separate fund which is hereby appropriated for the use of the department except as indicated. Withdrawals from the fund shall be by warrant of the director of the department of administrative services upon requisition by the secretary of agriculture. The fund shall be continued from year to year, provided, however, that if there be any balance remaining at the end of the biennium which, in the opinion of the governor, director of the department of management, and secretary of agriculture, is greater than necessary for the proper administration of the inspection and grading program referred to in this section, the treasurer of state is hereby authorized on the recommendation and with the approval of the governor, director of the department of management, and secretary of agriculture to transfer to the general fund of the state that portion of such account as they shall deem advisable.