“Pest” means any of the following things that is, or is liable to be, dangerous or detrimental to the agricultural industry of the state:
(a) Any infectious, transmissible, or contagious disease of any plant, or any disorder of any plant which manifests symptoms or behavior which the director, after investigation and hearing, finds and determines is characteristic of an infectious, transmissible, or contagious disease.
(b) Any form of animal life.
(c) Any form of vegetable life.