When the eggs hatch, the larvae have to eat their way into the bud and they get BT'd doing that, if it's any consolation.
I hand-squeeze buds with holes in them for the sheer joy of it.
I have also removed every flower as a form of revenge, but the victory is pretty hollow.
Renee

To be effective BT must be used before the larvae reach their full size. BT has also a very short life after spraying. Al