Pyrethre or natural pyrethrins, a plant insecticide
Pyrethre and Pyrethrins
Pyrethra is a plant insecticide extracted from dried chrysanthemum flowers. This insecticide is also called Dalmatian pyrethre (Tanacetum cinerariifolium). Kenya is the largest producer of pyrethre, followed by Tanzania.
The term "pyrethre" refers to the powder extracted from the dried flowers of chrysanthemum while the term "pyrethrins" refers to the six active compounds contained in this powder.
The 6 active esters contained in the term pyrethrins are:
Pyrethrins I and II, Cinerins I and II and Jasmolines I and II. They result from the combination of 2 acids (chrysanthemum acid and pyrethric acid) and 3 alcohols (pyrethrolone, cinerolone and jasmolone).
N.B.: Be careful, pyrethrins should not be confused with PYRETHRINOIDES which are synthetic products (permethrin, phenothrin, decallethrin, esdepallethrin).
What you need to know about the pyrethre
- The pyrethrins contained in the pyrethre are very unstable compounds: they are quickly decomposed by light, air and heat. They are therefore easily biodegradable materials.
- Half-life in the ground: 12 days
- Photodegradation (half-life): from 10 to 12 minutes in full sun
- Half-life in the air: 1.5 days
- Not detected after 14 days
Note: Persistent action is increased in the absence of light (UV), which favours the use of pyrethrins in the premises.
- Pyrethra attacks the nervous system of all insects. It inhibits female mosquitoes by preventing them from stinging and also has a repulsive effect. It is a contact and ingestion insecticide with a very broad spectrum of activity. It is also a neurotoxic (modulator of the dependent sodium voltage channel).
- If it is considered "toxic" on hot blood animals, it is active on fish and other aquatic organisms. It can, in concentrated form and in some people, create irritations or allergic reactions to it.
Toxicity - Ecotoxicity of pure pyrethra concentrated at 25%
- CL50 (4 h) acute inhalation: 3.4 mg/air
- Dermic irrigation: no irritant
- Eye irritation: no irritant
- Dermic awareness: not sensitizing
- CL50 (96 h): 5.2 μg/l
- CL50 (48 h): 12 μg/l
- Pyrethre is an authorized insecticide in organic farming.
- In outdoor use, it is best to use it in the evening to avoid its degradation by the sun.
- Its efficiency, depending on temperature and light, can vary from 12 to 48 hours. Being quickly diluted by water, you will have to retire after a rain.
- The effect of the pyrethre is immediate but following its concentration and resistance of the insect, the pyrethre can only create a shock effect on the affected insect, that is to say that the insect is only "paralysed" but not dead.
- In order to strengthen the action of the pyrethra, some products can be added to the preparation. The most common is the PBO (or Piperonyl Butoxide). Although authorized, this component is suspected of being mutagene and d'affect certain liver cells In mammals. We can also use "savon" or oil (colza, mineral). They act as "mouillants", thus allowing to increase the action of the pyrethra while remaining unsafe for health.
You will find on special file "Mosquitoes", a report by the AFSSET on the use of large-scale pyrethra against mosquito (chikungunya). This report shows the efficacy of this insecticide but also all toxicological and ecotoxicological properties.
Our plant pyrethra-based insecticides
Given the very high price of pyrethra (several hundred euros per kilo), it is always sold diluted and in concentrations that rarely exceed 1%. For conservation problems (the pyre is degrading very quickly in the light), it is often found in stores only in the form of aerosol bomb. We held two aerosol bombs based on plant pyrethra. Each of them having different properties, their use is therefore complementary. The 3rd product is not an aerosol but applies with a sprayer, it is our flagship product based on pyrethre: 4J.
1. Insecticide All insects ECODOOandFlying insecticide ARIES
Powered by air, these insecticides use alcohol as a solvent, making it very light and non-moulding. They will therefore be destined as a priority to treat volumes such as cupboards, cabinets,... and of course by closing doors and windows, the ambient air of the rooms. After drying, the products leave no visible trace.
2. Insecticide All Insects Pistal ARIES
Powered by air, this insecticide uses paraffine as a solvent, which makes it rather heavy but particularly effective on eggs, larvae and slow, which do not know how to do neurotoxics like pyrethre. It will therefore be primarily intended to treat insects like frelon, surfaces or cracks in direct jet, but not ambient air. After drying, the product leaves no visible trace.
3. Insecticide 4J
Penn'Ty Bio can't evoke a pyrethra-based insecticide without talking about its insecticide 4J. A flagship product for many years, this insecticide is effective against a large number of creeping and flying insects in our homes. This natural insecticide consists of plant and potassium extracts, it contains no salts of heavy metals, chlorinated compounds, organo- phosphorous compounds, phenols, dangerous for man and warm-blooded animals. It is obviously free from pyrethroids or any synthetic pesticides.