Bio-Pesticides Herbicides are chemicals used to kill or damage unwanted plants or parts of them. They are classified by chemical name, by chemical characteristics of the compound, by toxicity. Shop 25% Off Bio-Fungicides Insecticide is a chemical (such as carbamate) or biological agent (such as a virus, bacterium, or fungus) that deters, incapacitates, kills pests, including insects, rodents, fungi and unwanted plants (weeds). Shop 25% Off