The Larvicidal effect of four fungal aflatoxins against fourth instar larvae of the mosquito Culex quinquefasciatus Say (Culicidae: Diptera)
journal of kerbala university,
2014, Volume 10, Issue 2, Pages 79-88
AbstractThe aflatoxins of four different soil fungi Aspergillus terreus, A. niger, A. oryazae, and Penicillium chrysogenum were tested for the larvicidal activity against fourth instar larvae of mosquito vector Culex quinquefasciatus. The concentrations of fungal culture filtrates used in the study ranged from 0.25 to 1 mg/ml. The results showed that the larval mortality percent gradually increased with the exposure periods 24, 48 and 72 hours. Among the four fungal species tested aflatoxin extracted from A. terreus was highly toxic to larvae of Cx. quinquefasciatus, at concentration 1mg/ml the larval mortality percent was (90%) when compared to other three species of fungal culture filtrates. A. niger, P. chrysogenum and A. oryazae were (70.56, 25.56, and 0 %) after 48h respectively. The Electronic Microscopic tests of death larvae indicated that disorganized, shortened and damaged surface cuticle appeared after 48 h in fourth instar larvae of mosquito Cx. quinquefasciatus when treated with A. terreus aflatoxin compared to control treatments.
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