Will Bt Harm Worms

There is a pesticide which kills worms but is not poisonous to man or beast. The worm-killer is the bacteria Bacillus thuringiensis, or BT for short. When ingested, BT produces a toxic substance within the cells of its victims. Only certain species of caterpillars are affected by BT.

How long does it take BT to kill worms?

After two consecutive sprays that are timed about 2 weeks apart, approximately 99% of caterpillars will be killed.

What insects does Bacillus thuringiensis kill?

The toxin is lethal to several orders of insects, including Lepidoptera (butterflies, moths, and skippers), Diptera (flies), and Coleoptera (beetles), though a number of Bt strains are available to make its use more target-specific.