Field test with mixture of Sumithion and DDVP for the control of diazinon-resistant houseflies

Abstract

Control tests of the diazinon-resistant house flies with Sumithion and DDVP were carried out during September 25 to October 30, 1964, in Mihara area of Hokota Village, Kashima-gun, Ibaraki Prefecture. In late 1960, it was found that a remarkable diazinon-resistance had developed in the houseflies of this area. As residual sprays 0.5% Sumithion・0.2% DDVP emulsion was treated in three areas, while 0.33% DDVP emulsion was treated in one area. In the case of a mixture of Sumithion and DDVP, the fly population estimated by ribbon traps decreased markedly through the period of the experiment. On the other hand, the effect of whole DDVP emulsion was rather unsatisfactory.