The development of DDT-resistance in Musca domestica and Protophormia terraenovae.

In the course of studies on the effect of sublethal doses of DDT on flies, it has been observed that such doses cause disturbances in the process of oogenesis among both laboratory strains and wild populations of Musca domestica and Protophormia terraenovae.Changes in the susceptibility of a fly population to DDT are accompanied by changes in the percentage of females with disturbances of oogenesis, but further observations under natural conditions are needed before it can be said whether it is possible to use the proportion of females with such disturbances as a true indicator of the degree of development of resistance and consequently of the need to change the insecticide or the method of control.