Abstract
In order to know the effects of several organophosphorus insecticides against the last instar maggots of the flesh fly, Sarcophaga peregrina Robineau-Desvoidy, an investigation was carried out in the laboratory. Emulsions of eight insecticides, diazinon, malathion, dichlorvos, ronnel, trichlorfon, naled, fenitrothion and trichlorfon were tested through "the dilution contact method" which applies a thin layer of dilutions of insecticides. An explanation of this method will be published elsewhere. It was confirmed that three insecticides, trichlorfon, fenitrothion and dichlorvos, are most excellent in the (LC)_<50> value, and diazinon comes next, the others are in the following sequence, i. e., trichlorfon, ronnel, naled. Malathion may be applicable but it did not show the lethal effect to the maggots so far as these dilution rates are concerned.
