Its host specific. See the Uconn link in my first post.
Particular strains of Bt proteins are host-specific, binding to certain receptors in the insect's gut wall like a lock and key. It is important to use the strain of Bt that targets a certain pest. New to the home market in 2015 was the strain Bacillus thuringiensis galleriae (Btg) which is reportedly effective against both the adult and grub forms of Japanese, Asian, and Oriental beetles, all of which cause large amounts of damage to turf. The following are some of the most commonly used Bt strains: