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classification of insecticides

Classification of insecticide u00b7 Based on chemical composition, it is classified as organic and inorganic. u00b7 Based on the mode of entry in the insects, it is <br>

nikitasaini
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classification of insecticides

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  1. Classification of Insecticides Basedonmodeofaction Nikita saini B.Sc – medical (III yr) 202225

  2. Physicalpoisons Protoplasmicpoisons Insecticide Nervepoisons Respiratorypoisons Insectgrowthregulators

  3. PHYSICAL POISONS • Toxicants which bring about kill of insect by exerting a physical effect. • Asphyxiants –(cause unconsciousness or death by suffocation) e.g. Heavy mineral oils. • Abrasives – (loss of body moisture/dessication) e.g. Inert dust, aluminum oxide. • Absorbing moistures – e.g. Charcoal, activated clay. Fig : Activated clay Fig : Inert dust

  4. PROTOPLASMIC POISONS • Toxicants responsible for precipitation of protein especially destruction of cellular protoplasm and midgut epithelium. • e.g. Heavy metals like mercury, copper, formaldehyde, fluorine and arsenic compound. Fig : Insecticide containing arsenic compounds

  5. RESPIRATORY POISONS • Chemicals which block cellular respiration. • They combine with enzymes like cytohrome oxidase and other oxidases containing iron and inhibit their catalytic action. • E.G. Hydrogen cyanide, carbon monoxide, etc.

  6. NERVE POISONS These chemicals inactivate acetylcholinesterase. So formation of acetylcholine is blocked and nerve impulse conduction is disrupted. e.g. Organochlorines, Organophosphates, carbamates.

  7. INSECT GROWTH REGULATORS • An insect growth regulator (IGR) is a chemical substance that inhibits the life cycle of an insect. • IGRs are typically used as insecticides to control populations of harmful insect pests such as cockroaches and fleas. • HormonalIGRs typically work by mimicking or inhibiting the juvenilehormone (JH), one of the two major hormones  involved in insect molting. • Chitin synthesis inhibitors – interfere with process of synthesis of chitin due to which molting and development is disrupted.

  8. Examples- Hydroprene(Gentrol), Methoprene(Precron), Triflumuron(Starycide)

  9. Some larvae may stay in this juvenile stage until they die. Adults’reproductive organs are affected and the adult becomes sterile. Eggs treated with IGRs may never hatch. If the eggs do hatch, the young insect may not survive. Treatment with an IGR may prevent the pupa from becoming an adult and reproducing.

  10. Thankyou

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