• Grow a Lush Garden Organically
  • Weeds Can Be Managed Without Chemical Pesticides
  • Link to SK Organic Resources
  • Learn to Manage Pests Naturally
  • SNAP Tour of Organic Vegetable Garden
  • Learn To Manage Weeds Without Chemical Pesticides
  • Driving Near Recently Sprayed Fields Exposes People to Pesticides
  • SNAP Display at Event
  • Learn About Pesticides in Foods
  • LIving Near Fields Increases Pesticide Exposure

Pyrethrins and Pyrethroids

 also look at exposure and nervous system effects and pyrethrins

Pyrethrins are one class of insecticides. They are often marketed as "natural" and as "coming from the pyrethrum daisy". This is false. Pyrethrum is the chemical extracted from the pyrethrum daisy. It is not effective for very long so, to make this class of pesticides more effective and last longer, the pesticide industry has chemically produced synthetic pyrethrins, also called pyrethroids. All are toxic to the nervous system. They are known to trigger allergies. Several (alllethrin, bigentrhin, cypermethrin, lambda-cyalothrin, permethrin, resmethrin, sumithrin) have been recognized by the scientific community as endocrine-disruptors. They are also noted as accumulating in sediments in streams and water bodies, often at levels that kill all insects and other invertebrates living in sediments.

SNAP does not consider synthetic pyrethrins as green or reduced-risk products.

Permethrin  General Fact Sheet (NPIC- National Pesticide Information Center 2009) (USA) Even though it's an older fact sheet, it points to toxicity to fish and aquatic organisms, low degradation in indoor environments, and symptoms in animals and people.

Connecticut State Legislature Bans Residential Mosquito Misters (Beyond Pesticides, May 23, 2018) " Many health advocates have expressed concern that these products, able to spray toxic pesticides on a timer at regular intervals, pose a significant risk to pets and children who can be directly in the path of a mister’s spray. The chemicals employed in these machines are often synthetic pyrethroids, which have been linked to a range of human health effects, from early puberty in boys, to behavioral disorderslearning problemsADHD, and certain cancers. Neighbors who do not want to be exposed to these chemicals are also put at risk from pesticide drift." SNAP Comment: There are many kinds of  pyrethrins coming under various names. A quick PMRA label search done on 4 June 2018 indicates 368 pyrethrin products registered in Canada for domestic use (i.e. by consumers) At least 2 of those pyrethrin products  (# 29683 and 28972) are registered for misters. A complete search would have to be made for each registered pyrethroid to understand the extent of the problem in Canada. 

Pyrethroids are everywhere and  more dangerous than you realize (by Shruti Ravindran, The Verge,  Feb 19, 2014, US article)  A specific group of bug-killers, pyrethroids and pyrethrins, have been soaring in popularity in recent years and now account for more than a quarter of the global market.In 2008. (NOTE: For instance Raid contains types of pyrethroids.) The Center for Public Integrity analyzed 90,000 adverse reaction reports and found that health problems linked to pyrethroids had increased 300 times in 10 years. Up to 2/3 of people in studies have pyrethroid breakdown products in their urine. "A regulatory system that utilizes animal studies can't simulate the effect of toxins on children".

EPA Releases Pyrethroid Risk Assessment, Ignores Numerous Health Effects  (Beyond Pesticides, November 16, 2011)  concluding that these pesticides “do not pose risk concerns for children or adults,” ignoring a wealth of independent data that links this class of chemicals to certain cancers, respiratory and reproductive problems, and the onset of insect resistance. The agency may even consider registering additional new uses of these pesticides.

Recent Studies

Research Shows Commonly Used Pesticides Produce Greater Toxic Effect When Mixed
(Beyond Pesticides, August 11, 2011) A combination of eleven different kinds of commonly used pyrethroids were tested on mice in a new study which found that, at real-world exposure levels, the insecticides can produce heightened toxicity that is equal to the sum of each insecticide’s individual effect. The mixture of similar-acting insecticides works by over-stimulating ...

Report Documents Poisonings from New Generation Pesticides (August 4, 2008)  Pyrethrins and pyrethroids were responsible for more than 26 percent of all major and moderate human incidents involving pesticides in the United States in 2007, up from just 15 percent in 1998 — a 67 percent increase.                       

Pyrethroid Pesticide Affects Puberty at Low Levels  (Beyond Pesticides, Sept 22, 2008)      

Pyrethroid Pesticides Found in Homes and Daycare (Beyond Pesticides, November 3, 2008)  Centers 

also see nervous system effects (autism), Health/respiratoryAir Travelwildlife and Pesticide fact sheets on cyfluthrin, cypermethrin, permethrin, pyrethrin, resmethrin, sumithrin and piperonyl botoxide.