Pyrethrin is the naturally occurring pyrethroid insecticide extracted from pyrethrum flowers.
Permethrin is a synthetic form of pyrethroid insecticide, a slightly different molecule from Pyrethrin. Permethrin takes longer to decay in air or sunlight and is more toxic. Both are highly toxic to aquatic life, but Permethrin has a higher toxicity to mammals. Both should be used with extreme care if you have pets, especially cats.
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