A<unk>  is used to kill unwanted plants. Selective<unk> s kill specific targets while leaving the desired crop relatively unharmed. Some of these act by interfering with the growth of the weed and are often based on plant hormones.<unk> s used to clear waste ground are nonselective and kill all plant material with which they come into contact. Some plants produce natural<unk> s, such as the genus Juglans (walnuts).  They are applied in total vegetation control (TVC) programs for maintenance of highways and railroads.  Smaller quantities are used in forestry, pasture systems, and management of areas set aside as wildlife habitat.<unk> s are widely used in agriculture and in landscape turf management.  In the us, they account for about 70% of all agricultural pesticide use.
Herbicide
Deodorant
Pesticide
Alternative medicine
Oral contraceptive
Complementary medicine
Food additive
Male contraceptive