[The inhibiting action of alsystin on various developmental phases of the housefly]

Alcystine, inhibitor of moult and chitinization, was studied for its biological activity in all phases of house fly development. Drug highest efficacy was recorded when preimaginal stages were introduced into the treated substrate and during the intestinal treatment of the imago. Ovicidal effect was observed in fresh egg mass. Alcystine could be regarded as a promising preparation when used for housefly attractants and in the treatment of housefly breeding places.