| abstract |
The insecticide compositions described, used to exterminate Scarabs, include an effective amount of spores without sporangium of the pathogenic bacilli which cause a disease giving a lactescent appearance to said Scarabs. A process for the in vitro production of spores of the infectious bacilli of said disease in liquid media containing, as sporulation aids, starch, trehalose, yeast extracts, K2HPO4, as well as CaCO3 during the vegetative growth step and MnSO4, and optionally an ion exchange resin is also described. |