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Laboratory Bioassay of some Insecticides as Contact Poison against Third Instar Larvae of Glyphodes pyloalis Walker (Lepidoptera : Pyralidae)


     

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The nineteen conventional insecticides were tested as contact poison against third instar larvae of Glyphodes pyloalis in laboratory. The descending order of toxicity of the insecticides was : chlordimeform> formotbion > quinalphos >monocrotophos> toxaphene> carbaryl> fenitrothion> malathion (premium grade) :> methyl parathion > endosulfan > malathion + fenitrotbion > leptophos :> klofos :>dichlorvos > endosulfan > DDT > dimethoate> pyretbrum>chlordane>gamma-BHC. Monocrotophos, formothion and chlordimeform are 27 to 32 times more toxic than DDT. Relative resistance to these insecticides of Glyphodes pyloalis than Selepa celtis is also discussed.
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B. K. Gupta

Vijay Veer


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  • Laboratory Bioassay of some Insecticides as Contact Poison against Third Instar Larvae of Glyphodes pyloalis Walker (Lepidoptera : Pyralidae)

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Abstract


The nineteen conventional insecticides were tested as contact poison against third instar larvae of Glyphodes pyloalis in laboratory. The descending order of toxicity of the insecticides was : chlordimeform> formotbion > quinalphos >monocrotophos> toxaphene> carbaryl> fenitrothion> malathion (premium grade) :> methyl parathion > endosulfan > malathion + fenitrotbion > leptophos :> klofos :>dichlorvos > endosulfan > DDT > dimethoate> pyretbrum>chlordane>gamma-BHC. Monocrotophos, formothion and chlordimeform are 27 to 32 times more toxic than DDT. Relative resistance to these insecticides of Glyphodes pyloalis than Selepa celtis is also discussed.