If the board determines that there exists an area which is infested or infected with pine bark beetles or other insects harmful to pine trees or other trees in the district and the infestation or infection is of such a character as to be a menace to the pine trees and other trees of adjacent owners, the board may declare the existence of a zone of infestation or infection, and describe and fix its boundaries. (Ord. 14-239, 10-9-2014)