A pesticide is any substance or mixture of substances intended for preventing, destroying, repelling or mitigating any pest. A pesticide may be a chemical substance, biological agent (such as a virus or bacterium), antimicrobial, disinfectant or device used against any pest. Pests include insects, plant pathogens, weeds, molluscs, birds, mammals, fish, nematodes, and microbes that destroy property, spread disease or are a vector for disease or cause a nuisance.
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pesticide A general term for chemical agents that are used in order to kill unwanted plants, animals pests or disease-causing fungi.