Studies on the toxicity of some insecticides to grubs of Epilachna vigintioctopunctata Fabricius
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Date
1967
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Division of Entomology, Agricultural College and Research Institute, Vellayani
Abstract
Dosage mortality relationships between the insecticides DDT, BHC, parathion, malathion and sevin and the three instars of the grubs of E. vigintioctopunctata were ascertained.
The orders of susceptibility of the three instars to the different insecticides based on their ld-p-lines are as follows:- After 24 hours of contact
DDT III > I > II
BHC II > I > III
Parathion I > II = III
Malathion III > I > II
Sevin III > II = I After 48 hours of contact
DDT III > II > I
BHC II > III > I
Parathion I > II > III
Malathion III > II = I
Sevin III > II = I
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