By a resolution or ordinance adopted by a four-fifths vote, the board of supervisors may repeal any resolution or ordinance previously enacted whereby it elected to avail itself of this article. Upon the adoption of the resolution or ordinance of repeal, any forestry board previously appointed shall be discharged and the board of supervisors shall immediately take possession of the property and funds in the hands of the county board of forestry. The board of supervisors shall thereafter administer the powers and duties previously conferred upon the board of forestry.