EPA approves new nontoxic chemical that repels ticks and mosquitoes

Adding a new weapon to the fight against insect-borne illnesses like Lyme disease and malaria, the Environmental Protection Agency on Monday approved a new chemical that both repels and kills ticks and mosquitoes.

The chemical, nootkatone, an oil found in cedar trees and grapefruits, is so safe that it is used by the food and perfume industries.

Nootkatone is considered nontoxic to humans and other mammals, birds, fish and bees, the E.P.A. said in a statement.

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