Definition-EPA ".a pesticide is any substance or mixture of substances intended for preventing, destroying,repelling,or mitigating any pest." ".a pest is any harmful,destructive,or troublesome animal,plant or microorganism." US Environmental Protection Agency(EPA) A Small Dose of Toxicology A Small Dose of Pesticide-2/29/04A Small Dose of Toxicology A Small Dose of Pesticide – 2/29/04 Definition - EPA “.a pesticide is any substance or mixture of substances intended for preventing, destroying, repelling, or mitigating any pest.” “.a pest is any harmful, destructive, or troublesome animal, plant or microorganism.” US Environmental Protection Agency (EPA)