Activity of pyriproxyfen, an insect growth regulator, on Culex pipiens (Diptera: Culicidae)
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In order to find an adequate replacement of temephos an insect growth regulator (pyriproxyfen) was evaluated as agent that can keep water bodies free from mosquito larval development for a period of up to 6 days. Bioassays were conducted under laboratory condition against Culexpipiens (Diptera: Culicidae) larvae. Furthermore, the attractiveness or repellency of the water containing each of these two killing agents was estimated as oviposition substrate for this mosquito species. Results indicated that both temephos and pyriproxyfen were highly effective against mosquito larvae although they act in a different way, and they can eliminate the mosquito production for the period that they were tested. As it is indicated by the larvicidal bioassays, pyriproxyfen showed very good activity causing complete adult emergence inhibition and its effectiveness is almost equal to those of the organophosphate compound in terms of total mosquito mortality. The presence of temephos in the water had no effect on the attractiveness or repellency ofCx. pipiens oviposition substrate in contrast with pyriproxyfen which acted as repellant.