الفهرس 
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Abstract
The co=on housefly, Musca domestica is one of the
dominant species found in human habitations, in tropical and
subtropical regions, it has gained importance as a serious
vector of many infectious diseases of public health as cholera,
typhoid and dysenteries .... etc. In Egypt it was recorded as a
potential vector of diseases since ancient time. Sanitary or
environmental conditions provide a suitable facility for
propagation and prevalence of diseases and vector.
Conventional insecticides play an important role in the
overall fly suppression program. However, their intensive use
has been challenged, especially by the housefly, through the
development of resistance of these chemicals and their serious
side effects, including genetic damage to the associated
microorganisms, plants, animals and mankind itself (Garrett
et al., 1986). For instance Organophosphorous pesticides are
kno\vn to react \vith DNA generally as alkylating agents and
consequently they are potential mutagens in a variety of
organisms (\Vaters et al., 1980). At present, Pyrethroids have
potential for the control of house hold and agricultural pests,
and show particular promise for controlling pests of public
health because of their advantages over other chemical
insecticides.
Entomologists have long suspect that a change in the
target enzyme by an insecticide can be ultimate fertility
mechanism. A group of enzymes referred to as dehydrogenase
were biochemically investigated in a wide variety of insects,
the relative activities of the insect dehydrogenases may be
related to the function and energy demands of the different
tissues subjected for alternation by insecticides.