How does Bacillus thuringiensis (Bt) work? Bt makes toxins that target insect larvae when eaten. In their gut, the toxins are activated. The activated toxin breaks down their gut, and the insects die of infection and starvation.

How long does it take for Bacillus thuringiensis to work?

When properly applied, Btk kills 80%- 85% of gypsy moth caterpillars with each spray. After two consecutive sprays that are timed about 2 weeks apart, approximately 99% of caterpillars will be killed.

How does Bacillus thuringiensis kill pest?

Three-domain Cry toxins from Bacillus thuringiensis kill insect cells by inserting pores into the membrane. Pore insertion is assisted by transient interactions with ABC transporters. Cry toxins have diversified to target different ABC families in the course of evolution.