الفهرس 
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Abstract
The present work aimed at studying the effect of some IGRs on hatchability of culex pipiens eggs and viability of their larvae.The histopathological changes induced by these compounds in the insect larval and pupal stages were also studies .
Results showed that Dimilin was more effective than alsystin..the obtained results indicated that these IGRs are highly effective against larvae of culex pipiens . the comparative study showed that the second instar was more susceptible followed by the third and finally the fourth larval instar.