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The unique properties of pyrethrins are:
1. Proven safety to humans following extensive use for over 150 years as human antihelminthic, as a personal insect repellant applied to the skin, and for the control of human lice.
2. Very rapid paralytic action on insects identified as the “quick knock-down effect”.
3. Very wide spectrum of activity against different insects.
4. Unique in action against mosquitoes, with a very high toxicity, a pronounced repellant effect and the ability of sub-lethal doses to disorientate the female mosquito to the extent that she cannot “bite” to obtain a blood meal.
5. No residues which have any biological activity.
6. No persistence in the environment.
7. The charisma of a natural product obtained from a white flower.

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