Experiments to test the possibility of area-control of Phlebotomus with residual DDT were carried out in Peru, 1945 to 1947.
1.The results furnish additional support for the effectiveness of house spraying in protecting persons indoors.
2.Treatment of stone walls (the principal outdoor shelters and breeding places) produced marked reduction of sandflies.
3.Treatment of stone walls combined with house spraying reduced sandflies to an extremely low level. This effect still persisted after twelve to nineteen months.
4.The results were sharply localized within the sprayed areas, sandflies occurring in normal abundance in houses or caves 75 to 200 yards distant.
5.Practical control programs in camps of two large construction projects gave an extremely high degree of sandfly control, followed by the virtual cessation of new cases of cutaneous leishmaniasis or bartonellosis.
6.Analysis of the results in terms of the habits and life-history of Phlebotomus supports the possibility of achieving practical control by methods applicable to many of the Phlebotomus regions of the world.
a.Their flight habits make sandflies vulnerable to residual DDT throughout their adult life.
b.The long life-cycle delays the recovery of a depleted sandfly population.
Major, Sanitary Corps, Army of the United States.
Medical Entomologist, Gorgas Memorial Laboratory, Panama, R. de P.