The Isolation of Polyhedrosislike Virus from Bacillus Thuringiensis

Investigations have been undertaken in order to detect the existence of phages in three Bacillus thuringiensis strains; aizawai HD-134, galleriae HD-234, and kurstaki HD-341; their relations to the bacterial virulence and their relations to polyhedrosis virus. The results obtained showed that each bacterial strain contains different frequencies of phage particles which appeared as number of plaques following UV lysis induction. Bacillus thuringiensis can serve as an intermediate host for polyhedrosis virus. Its existence in the temperate or vegetative state in the lysogenic bacteria increased the efficiency of Bacillus thuringiensis in pest control.