How to Use Bt Pesticide as an Organic Pest Control

Learn how to use Bt pesticide to kill cabbage worms, tomato hornworms and other pests in your organic vegetable garden.


| April 24, 2013


This article is part of our Organic Pest Control Series, which includes articles on attracting beneficial insects, controlling specific garden pests, and using organic pesticides.

What Is Bt?

Bacillus thuringiensis, often abbreviated as Bt, is a naturally-occurring bacteria that makes pests sick when they eat it. There are two strains commonly used as natural pesticides.

Bacillus thuringiensis kurstaki (Btk) gives excellent control of leaf-eating caterpillars such as cabbage worms and tomato hornworms, but has no activity against insects that do not eat treated leaves. After the insects eat the bacteria, their guts rupture and they die. Bt is therefore one of the safest natural pesticides you can use in terms of controlling caterpillar pests of vegetables or fruits without harming beneficial insects.

Bacillus thuringiensis israelensis (Bti) can be useful in controlling fungus gnats in greenhouses or houseplants, or for preventing mosquito problems in standing water that cannot be drained or controlled with fish.

cedarblues
10/7/2017 11:58:34 PM

qtpie97173 I agree with you totally! UGH...People suck!


vvasilakos
7/21/2017 9:00:59 AM

I'm thinking that Texas was being sarcastic, and pointing out that this is NOT safe pesticide as it's killing monarchs.


vvasilakos
7/21/2017 8:59:29 AM

I'm thinking that Texas was being sarcastic, and pointing out that this is NOT safe pesticide as it's killing monarchs.






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