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The mosquito  Aedes aegypti  (L.) (Diptera: Culicidae) is the primary vector of dengue in the Americas. The use of chemical insecticides is recommended during outbreaks of dengue in order to reduce the number of adult mosquitoes; however, because  Ae. aegypti  is highly synanthropic, the use of insecticides in densely populated areas is a dangerous practice.  Leptolegnia chapmanii  Seymour (Straminipila: Peronosporomycetes) is an entomopathogenic microorganism that has demonstrated marked pathogenicity toward the larvae of a number of mosquito species, with little or no effect on non-target insects. Therefore, the purpose of this study was to determine the sublethal effects of  L. chapmanii  on fecundity, number of gonotrophic cycles, fertility, and relationship between wing length and fecundity in  Ae. aegypti  females.  Ae. aegypti  females that survived infection with  L. chapmanii  laid fewer eggs, had a smaller number of gonotrophic cycles, had shorter wings, and were less fertile than controls. This is the first study on the sublethal effects experienced by specimens of  Ae. aegypti  that survived infection with zoospores of  L. chapmanii . Although field studies should be carried out, the results obtained in this study are encouraging because the high and rapid larval mortality caused by  L. chapmanii  coupled with the reduction of reproductive capacity in  Ae. aegypti  females seem to cause a significant reduction in the number of adults in the mid and long term, thereby reducing the health risks associated with  Ae. aegypti .

The Sublethal Effects of the Entomopathic FungusLeptolegnia chapmaniion Some Biological Parameters of the Dengue VectorAedes aegypti