Pesticide means any substance or mixture of substances intended for preventing, destroying or
controlling any pest, including vectors of human or animal disease, unwanted species of plants
or animals causing harm during or otherwise interfering with the production, processing,
storage, transport or marketing of food, agricultural commodities, wood and wood products or
animal feedstuffs, or substances which may be administered to animals for the control of insects,
arachnids or other pests in or on their bodies. The term includes substances intended for use as a
plant growth regulator, defoliant, desiccant or agent for thinning fruit or preventing the
premature fall of fruit, and substances applied to crops either before or after harvest to protect
the commodity from deterioration during storage and transport.