author(s)
Mohammed M El-Bokl

abstract
In this study, thernlarvicidal activity and bioefficacy of two different extracts (acetone andrnhexane) of Artemisia herbalba, Lavandula multifida, Peganum harmalarnand Ruta chalepensis against the 3^rd instar larvae of Culexrnpipiens was performed under laboratory evaluation. The toxicity values ofrnacetone extracts based on Lc₅₀ values may be arranged in arndescending order as follows: R. chalepensis > P. harmala >rnA. herbalba> L. multifida. On the contrary, hexane extracts mayrnbe arranged as follows: L. multifida > A. herbalba >rnP. harmala > R. chalepensis. The data also revealedrnsignificant decrease in growth index in treated individuals ranged (2.00 -rn8.90) when compared to control (11.25). The sublethal concentrations of thernacetone extracts induced sterility in the progeny of C. pipiens mosquitoesrnranged 61(R. chalepensis) -73% (A. herbalba) whereas,rnhexane extracts induced sterility ranged 55 (A. herbalba) -64% (R.rnchalpensis). There are no negative effects on the hatchability of eggs.