الفهرس 
AcknowledgementOnly 14 pages are availabe for public view
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Abstract
Arthropods are medically important either by direct injury or by serving as vectors of disease agents. Houseflies, Musca domestica vicina. have been regarded as potential and often important agents for transmission of several bacterial, parasitic and viral infection. In respect to mosquito besides the well-known painful bites inflicted by the females, these insects are the proved carriers of parasitic and several viral diseases. It is clear that benefits of vector control are great especially in developing countries regarding the improvement and protection of human health. Resistance to pesticides is a chromic and wide spread problem associated with nearly all types of chemical control agents. Recently research worker~. are condensing their efforts to find insecticides that have specific selectivity against insects of public health importance triggering its action without any harm to the non-target biota. So it is of value to assess the effectiveness of different insecticides which are currently used against the insects of public health importance to avoid the. overusage of ineffective compounds. This study aimed to evaluate the larvicidal action of different groups of insecticides; a’gainst C.pipiens and M.domestica. Some of these compounds are currently used in the field of insect control e.g. OPs and synthetic pyrethroids in addition to other insecticides such as IGR (Dimilin) and botanical insecticide (Damsissa). This work has been done using: - a laboratory strain of C.pipiens and a field strain of M. domestica, the later has been reared in the laboratory for several generations to allow reversion of susceptibility. Serial concentrations for each one of the tested insecticides were applied to the larval stage of both insects. The results were analysed by the probit analysis method and the LC50 and LC 90 values with fiducial limits and slope values of the different insecticides used were estimated. , The obtained data concerning the susceptibility test of the 4th instar ~.piDiens larvae to formulated OPs (Malathion 57 EC and Dimethoate 40 EC) 24 hours posttreament showed that, the calculated LC50 values were 1.5 ppm and 6 ppm respectively. On the other hand a mixture of OP compound and synthetic pyrethroid [Fenitrothion-tetramethrin (10:1) EC] was more toxic than the single OP and i!s calculated LC50 was 0.058 ppm whcih may be due to the knocking down effect of pyrethroid. Regarding formulated synthetic pyrethroids, permithrin 25 EC showed higher toxicity than OPs which was increased by the use of the synergist, piper~nyl butoxide (P.B). The corresponding calculated LC50 value of permenthrin and permethrin with P.B. were 0.0185 and 0.0105 ppm orderly.