Abstract
AbstractA preliminary study was conducted to evaluate the effects of nine methanol fungal extracts on fourth instar larvae ofAedes caspiusandCulex pipiens(Diptera: Culicidae). None of the extracts tested showed larvicidal activity except for thePaecilomyces lilacinusextract, which showed 100 % mortality against the larvae ofAe caspiusafter 24 h. The LC50values of theP. lilacinusextract after 24 h were 190.66 μg/mL againstAe. caspiusand 254.25 μg/mL againstCx. pipiens, respectively. After 48 h, meanwhile, the LC50values were 65.70 and 164.13 μg/mL, respectively. Histological analysis of the midgut of the treated larvae ofAe. caspiusandCx. pipiensrevealed changes such as cell destruction, spacing between the cells and disruption of the microvilli, resulting in an appearance of vacuolization in the midgut. This article is the first report of the use ofP. lilacinusextract for the control ofAe. caspiusandCx. pipienslarvae and the data obtained may help to provide a better understanding of the mode of action ofP. lilacinusas an insecticide against mosquito larvae.
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