Evaluation of compounds for insecticidal activity on adult mosquitos. 4. Insecticidal activity and physical properties of some halogenated organophosphorus esters.

The effects of changes in structure upon toxicity to adult mosquitos and upon physical properties which are important in determining contact effectiveness and residual activity are described for a group of O,O-dialkyl O-halogenated-phenyl phosphates, phosphorothionates and phosphamido(thio)ates. This group includes such established insecticides as fenchlorphos, bromophos and iodofenphos.