The following things are public nuisances whenever they are found within the city:
(A) Any living or standing elm tree or part thereof infected to any degree with Dutch Elm Disease fungus, Ceratocystis ulmi (Buisman) Mureau, or which harbors any of the elm bark beetles, Scolytus multistriatus (Eich.) or Hylnrogopinus rufipes (marsh.)
(B) Any dead elm tree or part thereof, including logs, branches, stumps, firewood or other elm material from which the bark has not been removed and burned or sprayed with an effective elm bark beetle insecticide.
('69 Code, § 6.71, Subd. 3)