none The population growth of the parasitic wasp Bracon hebetor Say on larvae of the almond moth, Ephestia cautella (Walker), was compared with that on larvae of the lesser wax moth, Achroia grisella (F.), and the greater wax moth, Galleria mellonella (L.). When the ratio of host larvae to B. hebetor females was small, greater numbers of B. hebetor progeny were produced on G. mellonella and A. grisella while a large ratio of host larvae to B. hebetor females resulted in greater B. hebetor progeny production of E. cautella .