毒性是指一种物质对其它生物造成毒害或死亡的固有能力。农药对人和畜、禽等动物可产生直接或间接的毒害作用,使其生理功能受到破坏,这种性能称之为农药毒性。毒性大小通过所产生损害的性质和程度来表示。农药产品的毒性分级决定着农药产品的使用范围和农药生产、销售和使用者 Toxicity refers to the innate ability of a substance to cause poison or death to other organisms. Pesticides on humans and livestock, poultry and other animals can have direct or indirect toxic effects, so that their physiological function is destroyed, this performance is called pesticide toxicity. Toxicity is expressed by the nature and extent of the damage that has occurred. Toxicity classification of pesticide products determines the use of pesticide products and pesticide production, sales and users