Are natural pesticides less toxic than synthetic pesticides?

This general statement is a common misconception. Several naturally occurring pesticides are highly toxic, even carcinogenic. Copper sulfate is highly toxic and shown to cause liver disease. Rotenone is a plant extract found in some species within the pea family. It has received significant attention because of studies indicating a potential link to Parkinson’s disease. All pesticides, natural or synthetic, are reviewed and regulated by the Environmental Protection Agency (EPA).

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