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Insecticides 03
 

Insecticides 03

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    Insecticides 03 Insecticides 03 Presentation Transcript

    • • A well is to be disinfected. Its dimensions are as follows;1. Depth of water column = 20 m2. Diameter of the well = 6 m ( 1 cubic meter = 1000 litres of water )• On estimation of chlorine demand of the well water using Horrock’s apparartus, blue color develops in the 3rd cup.• Calculate the quantity of bleaching powder that would be required to disinfect the well.
    • • Volume of water in the well = πr2h = 3.14 x3x3x20 = 565.2 m3 = 565200 litres• Amount of bleaching powder required to disinfect 455 litres of water = 3x2g = 6 g• Amount of bleaching powder required for this well = (565200 x 6)/ 455 = 7.45 kg
    • Classification of Insecticides as per Chemical Composition
    • Dichloro-diphenyl-trichloroethane (DDT)• Group: Organochlorine Compound• Physical Appearance: White amorphous powder• Mode of Action: Contact poison-nervous system paralysis• Mode of application: residual spray
    • Dichloro-diphenyl-trichloroethane (DDT)…• Dosage of Application: 5% susp. / 100-200gm / sq ft• Effective against: Lice, Fleas, Ticks, Flies, Mosquitoes• Period of effectiveness: 18 months• Disadvantage: Persistence in living organisms like plants and some wild animals leading to ecosystem damage, insecticide resistance
    • Abate (Temephos)• Group: Organophosphorus compound• Physical Appearance: Brown Viscous liquid• Mode of Action: Contact poison• Mode of application: 50% EC. Only insecticide approved for use in potable water• Dosage of Application: 1ppm• Effective against: Anopheles stephensi
    • Malathion• Group: Organo- phosphorus compound• Physical Appearance: Yellow or clear brown colored liquid• Mode of Action: Contact Poison• Mode of application: – Malathion Technical (95%) for use as space spray – 50% Water Dispersible Powder (WDP) & emulsifiable Concentrate (EC) for residual control – 90% dust for use against fleas and lice
    • Malathion…• Dosage of Application: 2 g/m2 for Mosquitoes• Effective against: mosquitoes, houseflies, cockroaches, bedbugs, lice
    • Fenthion (Baytex)• Group: Organo-prosphrous Compounds• Physical Appearance: Brown liquid, Smell of garlic• Mode of Action: Contact poison, larvicide (Oils suffocate and poison the aquatic stages of mosquito)• Mode of application: residual spray
    • Fenthion (Baytex)…• Dosage of Application: 1 ppm• Effective against: – Culex quinquefasciatus (non-potable water) – Houseflies• Disadvantage: Injurious to aquatic vegetation and fish if not properly used
    • Mineral Oil (Mosquito larvicidal oil[MLO], Malariol)• Group: Kerosene oil, diesel oil, petrol and crude engine oil• Physical Appearance: Colourless or muddy Oil• Mode of Action: Contact poison, Cuts off air supply• Mode of application: Spray on the surface of water
    • Mineral Oil (Mosquito larvicidal oil[MLO], Malariol)• Dosage of Application: 40 – 90 liters / 10000 sq m• Effective against: Mosquito larvae• Period of effectiveness: To be applied once a week
    • Pyrethrum• Group: Natural Insecticides, plant extract – Flowers of chrysanthemum cinerariafolium – Active principles: pyrethrum 1 and 2,cinerins 1 and 2• Physical Appearance: Colorless liquid• Mode of Action: Contact poison
    • Pyrethrum…• Mode and Dosage of application: 50 to 100 ml of pyrethrum solution in kerosene oil is sprayed per 100 m3 of space• Effective against: Adult mosquito, other insects• Period of effectiveness: instant, no residual action
    • BHC ( Benzene Hexa-Chloride)• Group: Organochlorine Compounds – Technical HCH- 13-16% Gamma isomer – Pure HCH – 99% Gamma isomer (lindane)• Physical Appearance: White or chocolate coloured powder, musty smell• Mode of Action: Kills insects by direct contact and its vapour
    • BHC ( Benzene Hexa-Chloride)…• Mode of application: 50% Emulsifiable Concentrate• Dosage of Application: 25 – 50 mg per sq.foot• Effective against: Lice, Fleas, Ticks, Flies,• Period of effectiveness: Residual action for 3 months
    • Paris Green• Group: Inorganic, Larvicidal• Physical Appearance: Emerald green crystalline powder• Mode of Action: Stomach Poison• Mode and Dosage of application: Applied as 1% granules to water in which breeding occurs• Effective against: Anopheline larave,• Period of effectiveness: One week
    • Diazinon• Group: Organo phosphorus compound• Physical Appearance: Volatile liquid• Mode of Action: Fumigant action, Contact Poison• Mode of application: Fumigation• Dosage of Application: 20 – 40 % at dose of 100 mg/sq foot• Effective against: Flies, Mosquitos• Used in DDT resistance