This report is dealing with the fumigation of grain in granaries with phosphine against the main stored-grain insects in Yugoslavia. The phosphine gas was generated from phostoxin tablets which were inserted in the grain mass. The efficacy was tested by the mortality of laboratory-bred insects and insects of the natural infestation. The successful fumigation was depending on the temperature of the grain and of the storage rooms and on the exposure period. The control of hot spots by inserting tablets through a probe was successful, provided that these hot spots were not too numerous and could be marked off accurately.