Selective herbicides are herbicides that are effective in controlling weeds without affecting crops and killing only one or a certain type of weeds within certain environmental conditions and dosage ranges.

It can effectively control weeds within certain environmental conditions and dosage ranges without harming crops and herbicides that kill only one or a certain type of weeds. For example, Hecao Ke, Napujing can be used for dicotyledonous crops to control monocotyledonous weeds, and benzoxanthone is used for wheat field to control dicotyledonous weeds. Most of the herbicides used in agricultural production are selective herbicides. The selectivity of herbicides is relative. Excessive dosage ranges, improper application methods, or improper use periods can lose selectivity and damage crops.