sentence: Bacillus thuringiensis subsp. kurstaki strain PB 54 is a naturally occurring , indigenous wild ‐ type bacterium , initially isolated from cultivated soils in the region of Murcia , Spain.The representative formulated product for the evaluation was ‘ Belthirul ’ , a wettable powder ( WP ) containing 160 g / kg of Bacillus thuringiensis subsp. kurstaki strain PB 54 with a minimum bio ‐ potency of 32 × 10 IU / g ( min .