The Director of Public Works is authorized to prepare a list of noxious weeds which are injurious to humans, animals, other plants or property. In preparing such list, the Director of Public Works may utilize a list of noxious weeds as set forth by the State Noxious Weed Control Board or any county noxious weed control board. The list may be revised from time to time as determined by the Director of Public Works. (Ord. 969 § 3, 1981).