Insecticides - Pyrethrins and Pyrethroids

Pyrethrins & Pyrethroids

What are pyrethrins?

• Pyrethrins are insecticides that are derived from the extract of chrysanthemum flowers (pyrethrum).

• The plant extract, called pyrethrum contains pyrethrin I and pyrethrin II collectively, called pyrethrins.

What are pyrethroids?

• Pyrethroids are synthetic (human-made) forms of pyrethrins. There are two types that differ in chemical structure and symptoms of exposure.

• Type I pyrethroids include allethrin, tetramethrin, resmethrin, d-phenothrin, bioresmethrin, and

• permethrin.

• Some examples of type II pyrethroids are cypermethrin, cyfluthrin, deltamethrin, cyphenothrin,

• fenvalerate, and fluvalinate.

• Both type I and II pyrethroids inhibit the nervous system of insects. This occurs at the sodium ion

• channels in the nerve cell membrane. Some type II pyrethroids also affect the action of a eurotransmitter called GABA.

What are pyrethrins and pyrethroids used for?

• Pyrethrins are widely used for the control of various insect pests.

How do pyrethrins and pyrethroids work?

• Nerve cell membranes have a specific electrical charge. Altering the amount of ions (charged atoms)

• passing through ion channels causes the membrane to depolarize which, in turn, causes a neurotransmitter to be released. Neurotransmitters help nerve cells communicate. Electrical messages sent between nerve cells allow them to generate a response, like a movement in an animal or insect.

• Pyrethrins affect the nervous system of insects by causing multiple action potentials in the nerve cells by delaying the closing of an ion channel.

• Pyrethrins and pyrethroids act as contact poisons, affecting the insect's nervous system.

• Even though pyrethrins and pyrethroids are nerve poisons, they are not cholinesterase inhibitors like

• organophosphate or carbamate insecticides.

• Pesticide products containing pyrethrins usually contain a synergist (such as piperonyl butoxide).

• Synergists work by restricting an enzyme that insects use to detoxify the pyrethrins. A synergist allows the insecticide to be more effective.

How toxic are pyrethrins and pyrethroids?

• Pyrethrins are one of the least poisonous insecticides to mammals.

• Rats fed high doses (1,000 milligrams per kilogram of body weight or mg/kg) of pyrethrins showed liver damage.

• Rats exposed to pyrethrins exhibited difficulty or rapid breathing, incoordination, sprawling of limbs,

• tremors, aggression, sensitivity to external stimuli, twitching, and exhaustion.

What effect does fipronil have on wildlife?

• Pyrethrins are highly toxic to fish and tadpoles. They affect their skin touch receptors and balance organs.

• Pyrethrins are toxic to beneficial insect (such as honeybees) and many aquatic invertebrates.

• Pyrethrins are low in toxicity to humans, other mammals, and birds.

Signs of toxicity in humans.

• Inhaling pyrethrins can cause coughing, wheezing, shortness of breath, runny or stuffy nose, chest pain, or difficulty breathing.

• Skin contact can cause a rash, itching, or blisters

Which of our products contain pyrethrins and pyrethroids?

Protector Natural

Prevent Auto Aerosol

Prevent Auto Dispenser

Prevent Insect Repellent

Prevent Insect Repellent Wipes