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Bacillus thuringiensis (Bt) is a species of bacteria that lives in soil. It makes proteins that are toxic to some insects when eaten, but not others. The proteins are not toxic to humans because, like all mammals, we cannot activate them. Bt is not toxic to non-target wildlife. However, one type of Bt (aizawi) can be toxic to honeybees. Bt is used as an insecticide, typically, for insect larvae. Remember, it has to be eaten to work.

Information about Bt

Bt Fact Sheet (Web | PDF)

Bt Video (6:14 min.)

How can I remove pesticides from fruits and vegetables? (FAQ | Video)

What does it mean when food is organic? (FAQ | Video)


If you have questions about this, or any pesticide-related topic, please call NPIC at 800-858-7378 (8:00am - 12:00pm PST), or email at npic@ace.orst.edu.

Last updated January 24, 2024