Larvicidal activity of some fungal extracts on Aedes caspius and Culex pipiens (Diptera: Culicidae)

Journal Article
AL-MEKHLAFI, Fahd A. . 2017
رقم العدد: 
47
الصفحات: 
388–393
مستخلص المنشور: 

A preliminary study was conducted to evaluate the effects of nine methanol fungal
extracts on fourth instar larvae of Aedes caspius and Culex pipiens (Diptera:
Culicidae). None of the extracts tested showed larvicidal activity except for the
Paecilomyces lilacinus extract, which showed 100 % mortality against the larvae
of Ae caspius after 24 h. The LC50 values of the P. lilacinus extract after 24 h were
190.66 μg/mL against Ae. caspius and 254.25 μg/mL against Cx. pipiens,
respectively. After 48 h, meanwhile, the LC50 values were 65.70 and 164.13 μg/mL,
respectively. Histological analysis of the midgut of the treated larvae of Ae. caspius
and Cx. pipiens revealed 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 of P. lilacinus extract for the control
of Ae. caspius and Cx. pipiens larvae and the data obtained may help to provide a
better understanding of the mode of action of P. lilacinus as an insecticide against
mosquito larvae.