Inheritance of Resistance to Dieldrin in Anopheles albimanus Wiedemann

Abstract

Summary and Conclusions Parent and hybrid populations of dieldrin resistant (El Salvador) and susceptible (Panama) Anopheles albimanus were tested for resistance by exposing 2- to 3-day-old adults to the World Health Organization dieldrin-impregnated test papers. At 0.4 and 0.8% concentrations, the mortalities of the above populations were about 5 and 98%, respectively, while those of the F1 hybrids were somewhat less than those of the resistant El Salvador parent strain. Mortalities of the F2 and backcross populations in general agreed with those expected on the basis of monofactorial inheritance. It is concluded that in our laboratory populations, the ability to survive 2-hour contact with dieldrin on the part of 2- to 3-day-old, sugar-fed adult males and females is inherited as a simple factor, with resistance completely dominant over susceptibility.