| 11. | Treatment with topic agents such as permethrin or pyrethrin with piperonyl butoxide is exceedingly effective.
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| 12. | This year, Harris County sprayed 2 million acres with a pyrethrin commercially sold as Scourge.
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| 13. | The flowers of " Chrysanthemum " species contain pyrethrin which is a potent insecticide.
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| 14. | The first, pyrethrin, is made from the dried, powdered flowers of the pyrethrum daisy.
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| 15. | This is done because pyrethrin concentration has been shown to increase as elevation increases to this level.
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| 16. | Although pyrethrin is a potent insecticide, it also functions as an insect repellent at lower concentrations.
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| 17. | They were developed as a synthetic version of the naturally occurring pesticide pyrethrin, which is found in chrysanthemums.
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| 18. | Growing these plants does not require much water because semiarid conditions and a cool winter deliver optimal pyrethrin production.
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| 19. | For instance, in Japan, the flowers are hung upside down to dry which increases pyrethrin concentration slightly.
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| 20. | Another organic answer is a mixture of diatomaceous earth and pyrethrin, said Howard Garrett, a Metroplex organics expert.
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