Longitudinal Investigations of the Resistance of the Body Lice (Pediculus Humanus) to Insecticides in Bosnia and Herzegovina
DOI:
https://doi.org/10.5644/Radovi.218Abstract
Body lice collected every year from 1973 to 1977 in several districts of Bosnia and Herzegovina were exposed to various concentrations of insecticides DDT (0,04%, 0,2°/o, 2,5%, 5,0%); Gamma-HCH (0,02%, 0,1% and 2,5%); Pyrethrum (0,0016%, 0,008%, 0,04%, 0,2%) and Malathion (5% powder or 0,5% emulsion). A total of 4.833 body lice were tested using the method of W. H. O.
Between 4% and 7% of lice exposed to the lo\vest concentrations of DDT (0,04% and 0,2%); Gamma-HCH (0,02% and 0,1%) and pyrethrum (0,0014% and 0,08%) showed a distinct resistance. The control laboratory strain of body lice »Hamburg« gave 100% mortality. The lice exposed to higher concentration as well as to malathion (5% powder or 0,5% emulsion) and to pitroid “Pliva” showed 100% mortality.
No significant difference in mortality rate has been found betvveen lice exposed to insecticides in different localities and in several years of testing.
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