Oregon Revised Statutes Agriculture § 569.420

(1) The county courts of the several counties of this state hereby are required to levy a tax and create a fund to be known as the weed control fund for the control of weeds on county highways and public lands and for cooperation with individuals, state and federal agencies in controlling noxious weeds within weed control districts. The amount estimated by the county court as being sufficient for such purposes may be placed in the county budget and after consideration at the meeting held for the purpose of passing upon the tax levy by the electors of the county, may become one of the items for which expenditure may be made during the ensuing year.

(2) When such a fund is created, it shall be expended under the supervision of the county court in such manner as to effectuate the purposes of ORS 569.360 to 569.495.