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Pyrethrinoid family



Generality on pyrethrinoids

Synthetic analog of natural pyrethrins but with better stability in the light, they exercise toxic activity on the lice, mites and other arthropods by disturbing the transport of sodium in the membranes of nerve cells while being untoxic in mammals.

German studies have shown acute poisoning and some chronic effects after use of domestic sprays based on pyrethrinoids.

Contrary to what many people think, the use of pesticide containing pyrethroids is not without consequence. without being as dangerous as the very known ddt, these products are to be used in moderation. At penn'ty bio, we obviously recommend that you refrain from using this type of substances and prefer natural assets from the plant kingdom. our catalogue of insecticides and repulsives is based on this approach.

So that you know them better, we present below the main categories representing the family of pyrethrinoids, and synthetic active substances.



Cypermethrine

Cypermethrin is a phototable pyrethrinoid with a broad spectrum of activity, with prolonged action persistence. this substance is effective even at low concentration. For all these reasons, cypermethrin has been widely used throughout the world for the protection of a wide variety of crops (cereals, cotton, coffee, etc.)

This substance is listed on section 95 of the biocide regulation in the "insecticide" category (TP18).

Physico-chemical properties: Cypermethrin consists of eight isomers: 4 cis and 4 trans whose first are the most active. cypermethrin is available in the ratio cis/trans 40/60.
Aspect: very viscous liquid substance at room temperature, yellow to brown colour.
Content: 92% minimum.

Mode of action: Cypermethrin is used for many applications, both on flying insects and on crawling insects, both in aerosol and spray solutions. acting by contact and ingestion, it is effective against a wide variety of insects: domestic flies, meat flies and other dipteras, mosquitoes, guêpes, frelons, blabs, fleas, ear beads, beetles, lepidopteran larvae, aphides, xylophages insects, etc.

Use: The main uses are: – in public hygiene, for the fight against blabs, etc... and the long-term control of flies and mosquitoes – in domestic use (residual action aerosols against creeping insects: blabs, bugs, silver fish, etc.). – in industrial uses, for the preservation of wood and for the protection of other materials.

  • Acute toxicity (om classification): "moderately dangerous" for man in case of accident
  • Chronic effects:
    • Cerebral disorders and locomotion, polyneuropathy, a decrease in immunity was found in man after acute poisoning.
    • Possible carcinogen for humans according to the American environmental protection agency (epa,) immunotoxic effects in the laboratory animal.
    • Effects on the reproductive system and on the development highlighted in the laboratory animal.
    • Disturbance of the hormonal system identified in the laboratory animal and in wildlife.
  • Interactions: cypermethrin sees its degradation in the organism counter-carried by the presence of pesticides in the family of organophosphores and pipéronyl butoxide.
  • Particular sensibilities: Children would be more susceptible to cypermethrin than adults, at the same dose per kilo of body weight
  • Persistence: Persists about 3 months in air and on surfaces after professional treatment of premises
    Machine wash such as dry cleaning eliminate only part of the residue on textiles.
  • Ecotoxicity:
    • Very toxic to fish in which cypermethrin bio-concentrates and aquatic arthropods
    • Toxic to bees and other useful insects as well as spiders.



Cyfluthrin

  • Acute toxicity (om classification): "moderately dangerous" for man in case of accident
  • Chronic effects:
    • Neurotoxic in animals after acute poisoning but also after chronic exposure to low doses.
    • Has not been completely evaluated by the epa for its potential carcinogenic potential.
    • Effects on development highlighted in the laboratory animal.
    • Hormonal system disturbance evidenced by laboratory test.
  • Interactions: cyfluthrin sees its degradation in the body blocked by the presence of pesticides in the family of organophosphores and pipéronyl butoxide.
  • Persistence: Persists at least 3 days on the floor of a treated room (no measurements made after 3 days).
    Machine wash such as dry cleaning eliminate only part of the residue on textiles.
  • Ecotoxicity: very toxic to fish, toxic to bees.



Permethrine

Permethrin is a first generation phototable pyrethrinoid, used for many years in agriculture for the protection of cotton and cereals.

Its very interesting characteristics (effectiveness, low toxicity, good stability to light and heat, etc.). permethrin remains one of the most widely used pyrethrinoids for non-phytosanitary uses.
This substance is listed on section 95 of the biocide regulation in the "insecticide" category (TP18).

Physico-chemical properties:
Permethrin consists of a mixture of issomers: cis and trans whose first are the most active. at the commercial stage it was the ratio cis/trans 25/75 permethrin that was preferred due to its lesser toxicity.
Aspect: semi-crystallized substance at room temperature, amber yellow to brown.
Content: ≥93%

Mode of action:
Permethrin is an insecticide that acts by contact and ingestion; like all pyrethrinoids it is active in the nervous system by disturbing the conduction of the nervous influx along the axones.

Use:
Thus, thanks to a wide spectrum of insect activity, a good persistence of action, a favorable toxicological profile vis-à-vis humans and warm-blooded animals, permethrin 25/75 is still widely used and appreciated for many uses:

- in public health (against parasites such as lice, lice, ticks, etc., and vectors of endemia such as mosquitoes). The O.M.S recommends its use for the manufacture of impregnated nets
- domestic uses (anti-mouche aerosols, anti-cafards, anti-guêpes ... barrier-insect sprayer, etc.)
- in public hygiene, for the fight against blabs, chips, etc... and long-term control of flies and mosquitoes

  • Acute toxicity (om classification): "moderately dangerous" for man in case of accident
  • Chronic effects:
    • Cerebral disorders and locomotion, polyneuropathy, a decrease in immunity was found in man after acute poisoning.
    • Possible carcinogen for man according to the epa and the international cancer research agency (iarc).
    • Immunotoxic effects in the laboratory animal.
    • Effects on the development of embryos highlighted in the laboratory animal.
    • Effects on the reproductive system highlighted in the laboratory animal.
    • Disturbance of the hormonal system identified in the laboratory animal and in wildlife.
  • Interactions: permethrin sees its degradation in the body counter-carried by the presence of pesticides in the family of organophosphores and pipéronyl butoxide.
  • Persistence: Studies show that permethrine is found, thanks to the circulation of dust in the house, on all surfaces (including kitchen) in significant concentrations still 2 years after the initial application on a floor.
  • Particular sensibilities: Children would be more susceptible to permethrine than adults, at the same dose per kilo of body weight.
  • Ecotoxicity:
    • Very toxic to aquatic fish and insects in which permethrine bioconcentrates. some water crustaceans are also very sensitive.
    • Very toxic to bees and many other useful arthropodes.



Phenethrine

  • Acute toxicity (classification oms): very low probability that it presents an aygu danger to man.
  • Chronic effects: Hormonal system disturbance evidenced by laboratory testing.
  • Interactions: phenothrin sees its degradation in the organophorus family and the presence of pesticides in the organophosphorus family pipéronyl butoxide.



D-Tetramethrin

D-Tetramethrin is a broad-spectrum pyrethrinoid on insects.

This substance is listed on section 95 of the biocide regulation in the "insecticide" category (TP18).

Mode of action:
It is a very powerful slaughter agent (shock effect) acting by contact. it is effective on most flying and creeping insects, especially flies, wasps, cockroaches ..

Use:
D-Tetramethrin is widely used for the manufacture of aerosols and liquid, concentrated or ready-to-use products. alone or in combination with another mortality insecticide, such as Permethrine, deltamethrin, etc.
The addition of the synergist piperonyl butoxide allows for the potential of the activity (i.e., to increase its biological efficiency), while allowing for significant savings on the cost of the formulation.

  • Acute toxicity (classification oms): very low probability that it presents an aygu danger to man.
  • Chronic effects: possible carcinogen for humans according to the American environmental protection agency (epa).
  • Interactions: tetramethrin sees its degradation in the organism counter-carried by the presence of pesticides in the family of organophosphores and pipéronyl butoxide.
  • Ecotoxicity:
    • Extremely toxic to fish and aquatic arthropods.
    • Toxic to bees and other useful insects as well as spiders.
    • Not toxic to birds.

Deltamethrine

Deltamethrin is marketed as liquid concentrate for the formulation of industrial and household insecticides. this substance is very active including at very low concentration.

This substance is listed on section 95 of the biocide regulation in the "insecticide" category (TP18).

Composition:
Deltamethrin: 100 g/l.
Solvents : qsp 1 litre

Mode of action:
Deltamethrin is a very powerful multi-purpose pyrethrinoid, which acts by contact and ingestion. it is effective on most flying and crawling insects (moustics, flies, blabs, fleas, bugs, insects of grains and wood, termites, ...). It is a phototable, residual insecticide, which allows lasting protection against parasites.

Uses:
Deltamethrin is widely used in a variety of formulations: insecticide concentrates or ready-to-use products, such as domestic or professional liquids, aerosol solutions, disease vector control (chikungugnya, haemorrhagic dengue, mosquitoes (disturbing products in spatial treatment,) etc.