Field Experiment with the Use of Gamma-BHC for the Control of DLN and DDT Resistant A. Stephensi Mysorensis in the Khesht Area, Kazeroun, South of Iran

Abstract

In o rder to stud v the possible use o r BHC against DLN resistant A. stephensi mysorensis and with a view to determining the va lue of this insecticide in the control or malaria transmitted by th is vector, a Field Experiment (a rea sca le) was ca rried o ut in the Khesht Area. Kazcroun, southern Iran. during 1963. 32 vi llages with a population or 11 . 173 persons were sprayed wit h gamma-BHC (Lindane) at the ra te o r 1000 mg. base per sq. m., during Jul y 1963. T he eff ectiveness o r the insecticide was assessed by the a pplication o r various entomological techniques a nd a monthly pa rasite survey o r the entire population o r the experimental a rea was performed; some epidemiologica l facto rs related to the potentiality o r transmission were wo rked out to sec whether o r not BHC was able to in terrupt malaria transmission. These studies have shown that BHC, at the rate used in thi s experiment. can reasonably control the natural population or A . stephens! mysorensis 1'01' a period o r about 2 mo nths. d uri ng which the transmission or malaria was a lso interrupted or a t least reduced to much lower ra tes. It is concluded that, under th e prevailing epidemiological and environ menta l conditio ns or the experimental a re (and simila r areas) BHC can be used as an emergency spray against DLN resistantmalaria vectors.