A chemosterilant is a chemical compound that causes reproductive sterility in an organism. Chemosterilants are particularly useful in controlling the population of species that are known to cause disease, such as insects, or species that are, in general, economically damaging. The sterility induced by chemosterilants can have temporary or permanent effects. Chemosterilants can be used to target one or both sexes, and it prevents the organism from advancing to be sexually functional.[1] They may be used to control pest populations by sterilizing males.[2] The need for chemosterilants is a direct consequence of the limitations of insecticides. Insecticides are most effective in regions in which there is high vector density in conjunction with endemic transmission, and this may not always be the case.[3] Additionally, the insects themselves will develop a resistance to the insecticide either on the target protein level or through avoidance of the insecticide in what is called a behavioral resistance.[3] If an insect that has been treated with a chemosterilant mates with a fertile insect, no offspring will be produced.[1] The intention is to keep the percent of sterile insects within a population constant, such that with each generation, there will be fewer offspring.[1]