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Natural Pesticides
- Natural substances that control pests -
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Summary: There are nowadays many natural pesticides available to homeowners and gardeners that cover most pest control needs. Natural pesticides are generally safer to use and pose less risk to the environment than conventional synthetic pesticides.
Jack DeAngelis, PhD
OSU Ext. Entomologist (ret.)
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What is a "natural pesticide"?
 A pesticide is a substance that disrupts or kills organisms that we consider to be pests, which are generally weeds, damaging insects, or microbes that cause disease. Natural pesticides are pesticides that are made by other organisms, usually for their own defense, or are derived from a natural source such as a mineral.
Most people believe that natural pesticides are safer and more eco-friendly than man-made pesticides and while this is mostly true it is not always so. For example, nicotine is a natural pesticide in tobacco leaves, and the highly addictive component of cigarette smoke, but is in fact much more toxic than most modern synthetic pesticides.
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Plants produce many natural pesticides that they use for their own defense against insects and disease organisms. Photo by E.A. DeAngelis.
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While some natural pesticides are highly toxic most are actually much safer and more eco-friendly than conventional pesticides. Since they are also very effective natural pesticides should your first choice for most home and garden pest control needs.
Advantages of natural pesticides: eco-friendly, safer for user/applicator, and very effective when used correctly.
Disadvantages of natural pesticides: short residual activity (some users consider this to be an advantage), may be more expensive than older conventional pesticides, and somewhat less pest-specific especially when compared to newer synthetic pesticides.
Use the links below for information about the wide variety of natural pesticides that are now available to homwowners and gardeners.
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Natural garden and landscape pesticides
- Neem Oil - Neem oil is used in gardens and landscapes against insects that chew on plants such as black vine weevil.
- Insecticidal Soap - Insecticidal soap is used in gardens and landscapes against a variety of small, soft-bodied pests like aphids, spider mites and scale crawlers.
- Rotenone - Rotenone is an older, broad-spectrum natural insecticide used for a variety of garden and landscape pests. It is available as a powder or liquid.
- Spinosad - Spinosad is a newer, broad-spectrum insecticide for use in gardens and landscapes. Even though it is broad-spectrum it is generally safe for use around beneficial insects.
- Pyrethrum - Pyrethrum is an older, broad-spectrum insecticide for use in gardens and landscapes.
- Diatomaceous Earth - Diatomaceous earth is a dry, powdery material derived from the shells of marine organisms. It is used mainly to deter and kill crawling pests both indoors and outdoors.
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Least-toxic indoor household pesticides
- Plant Essential Oils (Botanical) - Wide variety of indoor and outdoor uses against a range of insect pests. Dust, liquid and aerosol formulations are now available.
- Diatomaceous Earth - Diatomaceous earth is a dry, powdery material derived from the shells of marine organisms. It is used mainly to deter and kill crawling pests both indoors and outdoors.
- Inert dusts - Inert dusts are made from naturally occurring minerals like silica or boric acid (borate).
- Boric Acid - Boric acid is used mainly in structural pest control against insects like termites, carpenter ants and powderpost beetles, and in baits for cockroaches. Boric acid is generally used in the borate form, often sodium borate.
What every gardener needs
At a minimum every gardener should be armed with insecticidal soap plus at least one relatively broad spectrum pesticide like neem oil, spinosad or pyrethrum. These natural pesticides will handle most of your garden's pest control needs in a safe and eco-friendly manner.
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Mission: To provide accurate, up-to-date and unbiased information for solving common insect and mite problems around your home, business and landscape using least-toxic methods.
Jack DeAngelis, Ph.D.
Please see the Disclaimer statements as well.
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Copyright © 2004-... LivingWithBugs, LLC. All rights reserved. Page Updated: 10/9/2009
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