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Biopesticides are pesticides made from substances found in nature that offer a less toxic alternative to man-made chemicals. As a class they’ve been used for a long time, but most traditional biopesticides haven’t been able to compete with synthetic pesticides on cost and effectiveness. Researchers around the world are working to change that by manipulating chemicals found in plants, animals, bacteria and fungi. They’re discovering new ways to use nature’s arsenal to build better biopesticides and so reduce the need for less environmentally friendly pest control.