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Is snopes really not a reliable source? Given that their raison d'être is dealing with controversy, they usually go to considerable length to check their facts lest they risk their reputation as a good place to go when you suspect something might be a myth. I've done a brief search, and can't find anything detailing snopes as a non-reliable source. — Preceding unsigned comment added by 93.97.48.95 (talk) 20:45, 28 September 2012 (UTC)[reply]

There is not a single source on the site that gives information past that page. It is just words on a page, which can say anything that anyone wants. WP:Verify requires a bit more than that. If you can't chase a subject back further than the original page and there is no research being discussed on the page, then it appears to be conjecture.JSR (talk) 20:53, 28 September 2012 (UTC)[reply]

fair enough. You're right - there's no reference link to the quoted article or even the title of where it came from. I'm not about to film myself being sprayed in the face with pyrethrin, although common sense + the paragraph below about toxic effects on humans should suggest that the snopes article is probably true! I'll see if I can dig up the original source of the quoted attack on Amish. — Preceding unsigned comment added by 93.97.48.95 (talk) 21:06, 28 September 2012 (UTC)[reply]

This statement is very misleading, "The study indicated that mothers of autistic children were twice as likely to have washed a pet dog with a flea shampoo containing pyrethrin while they were pregnant." The study goes on to say the validity of the study could be biased based off the fact that the figures used were self-reported and retro-active. Reference: http://www.autismspeaks.org/science/scientificmeetings/imfar_2008_abstract_autism_risk_household_pesticide.php

The statement should be ammended so it doesn't give the overwhelming impression that autism and pyrethrin use has been proven.

67.128.135.54 (talk) 22:40, 16 December 2008 (UTC)[reply]

There is little information here on how pyrethrin works, does it attack nerves in the body or does it attack brain receptors? Which ones, etc. I am unable to locate this data anywhere online. —Preceding unsigned comment added by 71.113.76.182 (talk) 21:01, 8 July 2009 (UTC)[reply]

Is there any known neutralizer to destroy pyrethrin stopping it's effects?

71.112.195.162 (talk) 22:07, 27 July 2009 (UTC)[reply]

The summary says that the two pyrethrins differ in the oxidation state of a single carbon atom. Yet according to the diagrams, they also differ in the number of carbon atoms. —Preceding unsigned comment added by 68.185.94.153 (talk) 03:59, 31 October 2009 (UTC)[reply]

I am a bit concerned that some of the text in this article may violate copyright laws. Specifically, some of the article is an exact quotation of parts of this article... http://pmep.cce.cornell.edu/profiles/extoxnet/pyrethrins-ziram/pyrethrins-ext.html

Opinions? —Preceding unsigned comment added by 69.253.201.14 (talk) 21:38, 19 September 2010 (UTC)[reply]

After carefully reading both articles, I found exactly ONE very small, three-sentence paragraph that was indeed copied word-for-word. Nothing else seems to be plagiarized from the source you listed, or is well paraphrased and properly cited with other sources. This article neither meets the criteria for speedy deletion, nor was there a reasonable justification to blank the whole page. In this case, with such a small portion in violation, you generally just want to delete the infringing content and go on with your day, and then perhaps properly re-write and cite the information from another source (of which there are very, very many). Drake144 (talk) 05:46, 22 October 2010 (UTC)[reply]

I reviewed the history and the infringing edit was: 00:28, 9 May 2009 Argeaux2 (talk | contribs) (6,654 bytes)

Drake144 (talk) 06:01, 22 October 2010 (UTC)[reply]

Well, thank you Drake. —Preceding unsigned comment added by 198.181.161.250 (talk) 20:21, 22 October 2010 (UTC)[reply]

Nanograms or milligrams? I have a problem with this: 'Children who were more highly exposed in personal air samples (≥4.34 ng/m3) scored 3.9 points lower on the Mental Developmental Index than those with lower exposures.' I think it's a typing error and it should be mg instead of ng — Preceding unsigned comment added by 109.166.133.188 (talk) 01:27, 6 September 2011 (UTC)[reply]

It should be mentioned in this article that this chemical is the primary one used for aircraft disinsection and that material health concerns wrt this usage have been identified as far back as 1996.

http://www.epa.gov/PR_Notices/pr96-3.html — Preceding unsigned comment added by 192.223.158.45 (talk) 14:05, 13 June 2012 (UTC)[reply]

Bibliography of Potential Sources (2015)[edit]

These are sources that we can use to expand the article.

• "Pyrethrins." Pyrethrins. Extension Toxicology Network, Mar. 1994. Retrieved. 22 Feb. 2015.
• Hansen, M. R., Jørs, E., Lander, F., Condarco, G., & Schlünssen, V. (2014). Is Cumulated Pyrethroid Exposure Associated With Prediabetes? A Cross-sectional Study. Journal of Agromedicine, 19(4), 417–426. doi:10.1080/1059924X.2014.945708
• Umina PA, Edwards O, Carson P, Van Rooyen A, Anderson A. High levels of resistance to carbamate and pyrethroid chemicals widespread in Australian Myzus persicae (Hemiptera: Aphididae) populations. J Econ Entomol. 2014 Aug;107(4):1626-38. PubMed PMID: 25195456.
• Lambkin TA, Furlong MJ. Application of spinosad increases the susceptibility of insecticide-resistant Alphitobius diaperinus (Coleoptera: Tenebrionidae) to pyrethroids. J Econ Entomol. 2014 Aug;107(4):1590-8. PubMed PMID: 25195452.

Egilmore15 (talk) 19:42, 22 February 2015 (UTC)Egilmore15[reply]

Summary of Future Plans for Article[edit]

We will be elaborating on the production of Pyrethrin from Kenyan flowers and how the flower industry is impacted by pesticides. We will also be elaborating on the existing content concerning the history of the use of Pyrethrin. Pyrethrin is used as an insecticide by many industries, but there are debates about the effectiveness and the development of potential resistance, which we plan to elaborate on, discussing potential alternatives to the use of Pyrethrin. The existing article discusses toxicity, but we will elaborate on this topic, breaking it into sub-sections to discuss Reproductive, Teratogenic, Mutagenic, Carcinogenic, and Organ Toxicity effects of the chemical. We also plan to include information about the legal history behind the use of the insecticide while updating information with more recent studies to support the information included. Egilmore15 (talk) 19:42, 22 February 2015 (UTC)Egilmore15[reply]

The article is about a chemical compound, pyrethrin, and its derivatives, which have remarkable biochemistry. The article is NOT about what is bad about pyrethrins. Strive to stay neutral. If there are negative consequences from uses of pyrethrins, let the data speak without editorializing. Be mindful of WP:SECONDARY (real, peer-reviewed published reviews or books, not Google searches). When you get close to human health, WP:MEDRS rules absolutely. Finally, remember that Wikipedia speaks to many nations, it is not a forum on U.S. views and regulations. Good luck, --Smokefoot (talk) 00:00, 23 February 2015 (UTC)[reply]

Here are some of the major (most highly cited) reviews on this topic published in the past 10 years:

• Osimitz, T. G., Lake, B. G., "Mode-of-action analysis for induction of rat liver tumors by pyrethrins: relevance to human cancer risk", Crit. Rev. Toxicol. 2009, 39, 501. 10.1080/10408440902914014
• Fantke, P., Juraske, R., "Variability of pesticide dissipation half-lives in plants", Environ. Sci. Technol. 2013, 47, 3548. 10.1021/es303525x
• Anadon, A., Martinez-Larranaga, M. R., Martinez, M. A., "Use and abuse of pyrethrins and synthetic pyrethroids in veterinary medicine", Vet. J. 2009, 182, 7. 10.1016/j.tvjl.2008.04.008
• Sudakin, D., "Pyrethroid insecticides: Advances and challenges in biomonitoring", Clin. Toxicol. 2006, 44, 31. 10.1080/15563650500394647
• Davies, T. G. E., Field, L. M., Usherwood, P. N. R., Williamson, M. S., "DDT, pyrethrins, pyrethroids and insect sodium channels", IUBMB Life 2007, 59, 151. 10.1080/15216540701352042

Please talk to your teacher or your teaching assistant about how to conduct searches and which hits qualify as highly reportable.--Smokefoot (talk) 02:22, 23 February 2015 (UTC)[reply]

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The table for boiling points and vapor pressures do not follow well-known general trends in molecular weight and structure versus volatility, and disagree with themselves. Cinerin I has the lowest BP listed (which follows from it's smallest MWT), but it has a vapor pressure about 18-fold lower than Pyrethrin I - itself with a stated BP about 42-44 C higher. This does not make any sense, considering how slight the structural differences are.

It seems that there is one source for Pyrethrin I, and another source for the other 5 compounds, regarding vapor pressure, as known general trends accurately order compounds by vapor pressure for these 5 only. Extrapolated, Pyrethrin I should have a vapor pressure of 9.8 x 10^-7 mmHg.

The accurate evaluation of volatility of these compounds is relevant in the emergent field of industrial separation of cannabinoids like THC by vacuum distillation. — Preceding unsigned comment added by 96.78.61.233 (talk) 00:12, 23 October 2018 (UTC)[reply]

Both references are to a business web page that makes the statements, but itself has no references to primary sources: "History." Pyrethrum Nature's Insecticide. MGK, n.d. Web. 23 Apr. 2015.

Tsu Dho Nimh (talk) 00:36, 5 March 2019 (UTC)[reply]

the article wording wrongly implies that spiders and ticks are insects Ribsci (talk) 17:41, 9 July 2020 (UTC)[reply]

This article was the subject of a Wiki Education Foundation-supported course assignment, between 10 August 2022 and 8 December 2022. Further details are available on the course page. Student editor(s): AF1798 (article contribs).

— Assignment last updated by Spmg98 (talk) 17:49, 28 September 2022 (UTC)[reply]

"Because of their insecticide and insect repellent effect, pyrethrins have been very successful in reducing insect pest populations that affect humans, crops, livestock, and pets, such as ants, spiders, and lice, as well as potentially disease-carrying mosquitoes, fleas, and ticks." This part of the article is missing a citation. Reid Harley56 (talk) 01:33, 8 November 2022 (UTC)[reply]

Why is this taken as fact without citation?

-ReidReid Harley56 (talk) 20:27, 2 December 2022 (UTC)[reply]

I'm in support of removing this statement. Pyrethrins are known to be highly susceptible to degradation in sunlight so they arent used for the protection of crops, pets, or livestock. Generally speaking pyrethroids are used for these purposes but not pyrethrins. Same Jams Tho (talk) 17:23, 11 May 2023 (UTC)[reply]

Pyrethrin can be persistent, based on net hydrophobic properties and because its many double bonds it may react forming some organic halides as derivatives, among other kinds of organic compounds, but in its original molecular structure Pyrethrin is not an organic halide. It doesn't contain any halogen atom as part of the covalent bonds of the organic compound. It may form some halides if some reactions occur, but it is not an organic halide when named pyrethrin. — Preceding unsigned comment added by MLearry (talk • contribs) 20:02, 18 January 2023 (UTC)[reply]

Indeed, it definitely is not. That was added by User:AF1798; thanks for removing it. The cited ref is of uncertain reliability anway (MDPI). DMacks (talk) 21:35, 18 January 2023 (UTC)[reply]