الفهرس 
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Abstract
The current work was carried out to evaluate the impacts of three
chitin synthesis inhibitors (CSI’s) (novaluron, hexaflumuron and teflubenzuron)
against C. pipiens larvae. The tested CSI’s were applied by impeding the 2nd
instar larvae on the selected CSI’s at different concentrations (0.000001,
0.00001, 0.0001, 0.001 and 0.01ppm). The study was concerned with the effects
on larval development. In addition, the treated larvae which exhibited any
morphological aberrations were recorded. The extended effect on the pupal and
adult stages.Moreover, two additional approaches, namely, biochemical and
histological were adopted. The obtained results can be summarized as follows:-
A-Biological effects:
Larval treatment of C. pipiens with the tested CSI’s had a pronounced
effect on the biological activities of this insect.
Larval mortality:-
All the tested compounds caused considerable toxic effects against the
larvae.The results demonstrated that teflubenzuron was the most effective and
induced 99% larval mortality at 0.01 ppm.
Larval duration:-