human
I've been hearing about a new type of weed that can help keep pests out of your garden. Can you tell me about it?
assistant
Sure, I know about this new type of weed called ‘Bt’ or Bacillus thuringiensis. It is a naturally occurring bacteria found in the soil and has been used for many years to control certain types of insects. It works by producing a toxin that is toxic to certain insects, but not humans or other animals. The toxin is produced inside the bacterium and then released into the environment when the bacterium dies.