Definitions
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun Plural form of
pyrethrin .
Etymologies
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Examples
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Least toxic insecticides include horticultural oil and insecticidal soap that have no residual activity after the spray has dried and botanical insecticides such as pyrethrins and neem oil that have short residual activity, often breaking down within several hours of exposure to sunlight.
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A number of over-the-counter treatments are available for exterminating lice, though there is a growing concern that the creatures are becoming resistant to common remedies like permethrins (which are in the product Nix) and pyrethrins (carried in R&C and Rid).
Glenn D. Braunstein, M.D.: Nitpicking the Lousy Facts on Head Lice M.D. Glenn D. Braunstein 2011
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Just like Chrysanthemum pyrethrins, it can cause skin sensitization (rash) in certain people.
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About 90 percent of the cases were linked to pyrethroids or pyrethrins, common insecticides sometimes used against bedbugs.
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Just like Chrysanthemum pyrethrins, it can cause skin sensitization (rash) in certain people.
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A number of over-the-counter treatments are available for exterminating lice, though there is a growing concern that the creatures are becoming resistant to common remedies like permethrins (which are in the product Nix) and pyrethrins (carried in R&C and Rid).
Glenn D. Braunstein, M.D.: Nitpicking the Lousy Facts on Head Lice M.D. Glenn D. Braunstein 2011
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However, the safest choice to make is a product containing pyrethrins.
Safer Alternatives 2010
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A number of over-the-counter treatments are available for exterminating lice, though there is a growing concern that the creatures are becoming resistant to common remedies like permethrins (which are in the product Nix) and pyrethrins (carried in R&C and Rid).
Glenn D. Braunstein, M.D.: Nitpicking the Lousy Facts on Head Lice M.D. Glenn D. Braunstein 2011
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A number of over-the-counter treatments are available for exterminating lice, though there is a growing concern that the creatures are becoming resistant to common remedies like permethrins (which are in the product Nix) and pyrethrins (carried in R&C and Rid).
Glenn D. Braunstein, M.D.: Nitpicking the Lousy Facts on Head Lice M.D. Glenn D. Braunstein 2011
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Sprinkling pyrethrins, derived from a plant material, on the bugs might kill them, Hamilton says, but the insecticides have no residual effect.
For gardeners, stink bugs are not a problem to sniff at 2011
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