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

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.