Whenever any competent City authority or competent State or Federal authority, when requested by the City Council, prepares a statement in writing, based upon a laboratory test or other supporting evidence, that trees, tree materials, shrubs or hedges located upon private property within the City are infected or infested with or harbor any tree or plant disease or insect, pest or larvae, the uncontrolled presence of which may constitute a hazard to or result in the destruction or damage of other trees, shrubs or hedges in the community, describing the same and where located, the City Council shall direct the City Clerk to issue notice in the manner prescribed by Section 7-2-7 of this Chapter requiring the owner, agent or occupant of the premises to treat or remove any such designated tree, tree material, shrub or hedge. (1983 Code § 11-305)