The distribution and site of action of DDT applied externally (and internally) to adult house flies Musca domestica L. (Diptera: Muscidae).

Many investigators have sought evidence on how and where DDT (l, l, l-parachlorodiphenyl trichlorethane) penetrates the insect body and where it effects its lethal action. Disagreement in the results and interpretation of results still leaves much doubt as to where penetration is most easily effected and the writer could find no good evidence in the literature pointing at all conclusively to any site of DDT action. Definite information on these points should be of value in formulating DDT insecticides and designing methods for their use