Pesticide [W]

A pesticide is a chemical used to control, repel, attract or kill pests. For example, insects, weeds, birds, mammals, fish, or microbes, that are considered a nuisance. Pesticides are usually, but not always, poisons. Pesticides cause destruction or prevent development and include: herbicides (weeds), fungicides (fungi), insecticides (insects), molluscicides (snails), acaricides (mites) and rodenticides (rodents).