11.   De Meillon is credited with creating an insecticidal spray that kills adult mosquitoes and stops the spread of malaria.

12.   However, that method is expensive and kills only a small portion of adult mosquitoes without destroying larvae which can develop into adults within days, experts say.

13.   However, they only kill larvae and have no effect on adult mosquitoes.

14.   Officials have placed traps to collect adult mosquitos in the area, about four miles northeast of the U.S. Capitol.

15.   The trap designed to capture host-seeking adult female mosquitoes will be used throughout the state.

16.   There is no need yet to apply insecticide to kill adult mosquitoes, he said.

17.   Then authorities will spray residential areas to reduce the numbers of adult mosquitos.