ABSTRACT
Pharaoh's ant, Monomorium pharaonis is a tropical species first reported in England in 1828. The death of colonies of M. pharaonis exposed to hormone-based baits is a result of the morphogenetic effects of the hormone on the brood stages together with the action of the compound on the ovaries of queens which become atrophied and stop producing oocytes. In addition to the known effects of hormone analogues on development and reproduction in M. pharaonis, other factors associated with the particular life-style of ant species undoubtedly contribute to the susceptibility of Pharaoh's ant to hormone-based control methods. Information on the longevity of queens and workers of other pest species is scarce. Since good attractancy is a prerequisite of any successful baiting method, evaluation of the effectiveness of hormone analogues against these and other species will depend upon the development of suitably attractive Methoprene baits.
